Nintendo has made May 19th Multiplayer Battle Day for Kid Icarus: Uprising. Although there are no sponsored events taking place by Nintendo, there is a listing of MeetUp communities across the US putting together events in their areas. According to Nintendo, the top 20 US MeetUp locations will receive some premium items including AR Card packs and t-shirts.
May 19 is Multiplayer Battle Day for Fans of Kid Icarus: Uprising for Nintendo 3DS
Be sure to check out the Nintendo 3DS MeetUp community to RSVP for an event in your area.