19 Unique Joint Birthday Party Themes

Joint birthday parties can be really tricky to pull off properly, especially if both birthday celebrants have different interests. Fortunately, we at Peerspace have a few unique joint birthday party themes to try that will make everyone happy! From DIY crafts to themes that cater to all genders, you’re sure to find a fun idea with us.

1. Frozen and Fortnite for boys and girls

Dual-gender joint birthday parties can be a challenge to pull off. But sometimes the contrast between sibling interests is what makes the party so enjoyable. Does she want a Disney Frozen party while he wants Fortnite? Let both kids have what they want; mix and match the decorations as you like! It will be both funny and memorable for everyone attending if Fortnite and Frozen come together 

2. Let both girls be princesses for the day

Princess parties let girls get elegant while dressing up at the same time! You can easily combine this joint birthday party theme with another theme like a garden tea party or a winter wonderland. Be sure to choose a venue that’s equally elegant. Did you know that Peerspace has loads of cute party venues near you for a princess birthday party? Check out this pink Barbie room in Twentynine Palms, CA, for an indoor princess party!

3. Send joint birthday invitations

Give guests the chance to dress the part and bring party snacks or gifts to the event that match the theme by letting them know in advance it’s a joint birthday party. The joint birthday invitations should include art that lets everyone know the theme(s) you have in mind. We recommend custom joint birthday party invitations like these we found for you via Etsy!

4. Choose your favorite dinosaur party

Triceratops, Tyrannosaurus rex, velociraptors…Which is your kids’ favorite dinosaur? Throw a dinosaur party for them where you have decorations using those two dinosaurs. Boys and girls both love dinosaurs so there’s no reason to think of this as a gendered birthday party theme!

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5. Decorate the birthday cake with both themes

One of the most challenging aspects of throwing a joint birthday party is deciding on what kind of birthday cake to serve. If it is a superhero and princess party, well, why not have half of the cake showcase Marvel heroes while the other half is decorated in pink and princesses? Or you can blend both styles with cake toppers using both themes. The cake, like the venue and decorations, should be a sign of the joint party theme!

6. Use birthday signs that include both children’s themes

Birthday party signs with the child’s name and age on them are a popular way to decorate a birthday venue. So how about using themed party signs? For a cowboy birthday, you can use vintage lettering and a cowboy hat on one half. If the other part of the joint theme is a princess party, then be sure to include a looping cursive script and a Disney princess!

7. Create custom sides of the party for each kid

Joint birthday parties have to find the right balance between celebrating the uniqueness of each kid in a single party space. You can recognize the interests of both kids by having two separate tables decorated in different ways. One table might be dedicated to the theme or favorite color of one child, while the other table is decorated in a completely different theme or favorite color!

8. Host a tea party for the little ladies

Tea parties can mean dressing up, celebrating in an outdoor venue, and enjoying finger sandwiches and other fancy snacks! If you have two children who want something a little more elegant, then think about making it a joint tea party! A joint tea party still has room for individuality since the kids can each choose their own favorite snacks, colors, flowers, and tea party games to include! 

9. Fly to the Moon with a space party

Exploring the final frontier is something almost all kids find exciting! A space party could mean choosing decorations like planet garlands, the Moon, eclipses, and stars to hang up. Food like sugar cookie stars and an astronaut cake should definitely be included. You’ll also want a party venue to match the theme, like this neon-lit immersive venue in Westminster, CO!

10. Dip into nostalgia with a decade party

What about older joint birthday celebrants who might be separated by decades yet share the same calendar date? Get nostalgic with a decade party! Guests can dress the part of the chosen decade while dancing to music from that period. 

11. Dress up as superheroes

Boys and girls alike will be able to embrace this joint birthday party theme because there are dozens of male and female superheroes to choose from! No doubt they already have their favorite so let them dress up as Wonder Woman or Spiderman for their birthday. Encourage their friends to also show up in a superhero costume. And of course, don’t forget plenty of party plates, cups, and banners with their favorite heroes! 

12. Use a shared party theme with personalized decorations

One way to bridge the individuality of each child is by using one theme with custom decorations. For example, if “Finding Nemo” is the shared theme then how about letting one child stick with Marlin while the other goes with Dory? You can also string up custom garlands and other decorations with each child’s face in different parts of the room!

13. Host a Princess and Marvel party

Since Disney owns Marvel Comics, it’s easier than ever to bring the two themes together for a joint birthday party! We’re more used to seeing Captain America and Ariel standing side by side and you’ll find plenty of party decorations made by Disney that match the joint theme. Encourage party guests to come dressed up as their favorite princess or hero as well. If you want to get a little creative with this theme, how about having everyone be a superhero princess instead? Check out the included image for a little inspiration!

14. Become superhero princesses for the day

There are superheroes, there are princesses, and there are superhero princesses! Why not skip the divide and make this joint party one where everyone gets to be both at the same time? Dress up in a cute skirt, wear a mask, and pretend to fight crime with a sparkling wand! A superhero princess party is fun for all ages and genders plus it encourages some spectacularly creative party outfits and decorations.

15. Get creative with a DIY crafts party

Party games and cake are expected at any party, so how about something a little more unique as a joint birthday party theme? If your kids are into DIY crafts then have them and their friends get creative during the party! You can even set up dual craft stations to celebrate their individuality if both kids are into different activities. Build a drawing station, teach them how to make clay figures, or set up painting easels for a fun crafts party. Guests even get to return home with a homemade party favor this way! 

16. Choose a party venue that caters to diverse interests

One of the best ways to please both birthday celebrants is by choosing a party venue with more than one thing to enjoy. Entertainment centers have video game arcades, water parks, private party rooms, go-kart racing, and other activities all under a single roof. You can ensure each kid can do something they enjoy with their friends this way! 

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17. Let both kids choose the snacks

Letting both celebrants decide what is on the menu is one of the most important ways to ensure everyone is happy! That might mean an especially creative party table where afternoon tea is served alongside movie popcorn, but so be it. Both kids will recognize that you’re celebrating both of their wishes this way and it will make for a truly memorable birthday party.

18. Make it a double TV show or movie party

Movies and TV shows are a great theme to build off of so why not have each birthday celebrant choose their favorite and build a party theme around both? Spongebob and Bluey can come together under one roof for an afternoon, as can Dora and Batman!

19. Celebrate with a double color or rainbow color party

What kid doesn’t already have a favorite color or two? Make color the theme of the day with outfits, party food, and decorations in each kid’s favorite color. We’ve explored this theme in depth and have a few color party food ideas to get you started. You can even make it a rainbow party to celebrate all of their favorite colors, along with a few of our favorite rainbow color party food ideas to enjoy!

Joint birthday party themes: conclusion

As you can see, joint birthday parties have a lot of potential when it comes to themes. You can choose two themes and merge them or use a single theme that caters to their uniqueness with the right snacks, games, and decorations! Peerspace is chock-full of wonderful party ideas like these as well as event venues near you for kids’ birthdays and other special events!

Find unique birthday party venues on Peerspace