If you bring a videocamera, please don't use the autofocus function - it'll emit IR and mess up the navigation or beacon detection routines. Please respect the huge amount of work that's gone into this project, even teams that don't have working robots have been slaving away for at least 8 months. Batteries, switches, glue, buttons, etc. Robots passively detect each other. Each robot can also detect this light.
More info is available here .