The Association for Unmanned Vehicle Systems International (AUVSI) is hosting its official hackathon, XBuild, Apr. 28-29 in Boulder, Colorado. The event is free for participants and will provide hardware including soldering kits, drones, HTC Vives and more to teams of two to five people to build new, innovative unmanned systems. The event running Apr. 28 at 9:00 a.m. to Apr.