A nostalgia party is the perfect theme for a class reunion, anniversary party or even just a planned get-together with friends. Theme the event to the decade you graduated high school for a reunion or the decade you were married for an anniversary celebration. Encourage guests to dress up in past fads and fashions, and decorate the venue with photos from the time period. Teens might enjoy a nostalgia theme for a class dance, dressing in the fashions from the decade of their early childhoods. A nostalgia-themed event might also be a fun way to raise money for your favorite charity. No matter who's on the guest list, don't forget to play plenty of music from the decade you choose!