I'm fairly confident that a capable machine shop for an event can fit in a road case if we're clever.
Something like this would be able to do most machining jobs needed at an event. I'm sure less expensive options can be found.
Other necessities off the top of my head:
- Tap, Die, and Drill sets
- Wrenches, screwdrivers, sockets, pliers, files
- Band Saw
- Belt sander