How thoughtful of you!
You could consider a cash donation to the organization that's putting on the event, whether it be a Safe Kids coalition, a public health department, or something else. Believe me, their CPS programs are always underfunded, and I'm sure any donation will be greatly appreciated.
Also keep in mind some techs may not be allowed to accept tips. For example, if they're a police officer and they're on the clock for the event, there may be rules against accepting extra money or gifts. That doesn't mean you shouldn't offer if you feel it's the right thing to do. I just want you to be prepared in case they can't take it.
Just having your car come in would be fun enough for me.
:ROTFLMAO:
Well yes, there is that, but I think folks around here are the exception rather than the rule.