Music And Gaming Festival
MAGFest is a four day long party, at the National Harbor, just outside of DC, dedicated to the appreciation of video game music, gaming of all types, and the gaming community. The festival runs 24 hours a day, and offers consoles, arcades, tabletop, LAN, live video game cover bands, chiptunes, vendors, guest speakers panels, a Music And Gaming Education Symposium, and you could apply to showcase your own games. Read more at http://magfest.org/.
MAGFest also holds other smaller events throughout the year.