On a couple of gigs my band did this summer that were fairly large outdoor venues ( anything around 300 people is big to us)we seem to incur an unusually large number of request from people wanting to sit in with band. While its rarely a bass player that makes this request, I still feel a responsibility to my bandmates not to make decisions on request to sit in without consulting them. Bare in mind these gigs were not jam sessions and no request came from any players or singers that any of us knew of or about at all.While I've always felt its important to treat your audience graciouslly these situations are always touchy ones. Past experience has not been very good, nine out ten times the sit in is not considered very talented by the band after the fact. It seems to me that these things tend to belittle all the work of rehearsal,set list, etc. Not unlike being reduced to a kareoke machine or something. any comments or experience ?