I'm sure I'm not the only person who's been at a gig and been asked by a member of another band to use some of your equipment or instruments. I've only been asked twice, once for a guitar, once for an amp and didn't let them. One time though, my amps ride had to leave anyways(I drive an Audi TT and with the back seats folded down, it's an inch too narrow to fit my 4x12) so a friend was putting it in his car and had to leave after we finished playing. It's not that I'm a selfish dick, I might do it for someone I knew as long as I trusted them. I take very good care of my things(not just music gear, if I spend my money on something, I'm going to treat it well). With random people, I don't know that they put the same care into things as I do. Overall though I'd always be more open to letting someone use an amp than a guitar. So how do you guys feel about this and usually handle the situation? Also, unless something happens at the last minute, I question the type of person that thinks it's OK to show up to a gig without even knowing for sure that you will have an instrument and/or amp to play. That's one of the most unprofessional things I can think of to do. If you don't end up getting stuff to use, I wouldn't plan on the owner having you back to "play" there again.