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A 21st birthday party should be epic. If you're struggling for amazing ideas for a 21st birthday celebration, look no further. Celebrate with a theme party such as a Roaring' 20s theme, complete with costumes, accessories and a Roaring' 20's tiara for the birthday girl. Other great 21st birthday party ideas include a luau, Disco night, masquerade or Hollywood-style party with a red carpet, spotlights and lots of props to create fantastic photo ops that your guests can post to their favorite social media. Brainstorm with friends and family for more 21st birthday ideas. The party's theme will determine its location, whether it's best to hold it at someone's house, outdoors or at a public venue. With the right décor and supplies, you can transform any space into a spectacular party.