Into the vintage trend but think it's too formal for your style? Try a more whimsical take on the theme and play with a few different ideas! I love this vintage circus idea, but retro diner/ice cream shops, or a 1950s picnic all make for some great themes, both inside and outdoors!
Here are some visual queues for my speakeasy reception idea. "Just remember, a Prohibition Era theme means booze by the barrel, not booze free." The smoky, hazy, loud and crowded atmosphere, all with the idea that you're doing something wrong would be a really fun way to foster camaraderie between your guests before the dinner and dance start.