Photomosh - Turn anything into a vaporwave
Meetup - Helps groups of people with shared interests plan events and facilitates off line group meetings in various localities around the world.
MVGEN - Make your own music videos with audio, gifs, and special effects
Eventbrite - Discover Great Events or Create Your Own & Sell Tickets
HearSeeParty - Combine Gifs with with music using tags
Calendify - Calendify is an event community where you can share, publish, and subscribe to event calendars. It helps you to stay informed about what you are interested in and what is yet to come.