Possible session... Utilize several setups (SB, laptop, projector, speakers, vcr, document camera)...either all together if you have boards on stands or perhaps use one hall with SB setup in each classroom.
Start with everyone in one location discuss and demonstrate the proper connections for all equipment.
Then let small groups visit a classroom or station and properly connect the equipment.
Alternatively, disconnect one wire or change a setting and then let the groups troubleshoot and solve the problem. Each station could have a different problem and the groups move between the stations. Or, the facilitator can move between stations checking solutions and creating new problems to solve.
Advanced sessions...LCD projectors, Document cameras