IMO its about responsible communication, as drummers we want things kinda down to the minute, esp when we're bringing our gear.
I remember doing this 3 piece (drums bass and keys)jazz gig at for this birthday party. The guy who booked us at the last minute negotiated for us to begin playing at 6pm. Now, from the beginning, I told him my boys had another gig at 10, so we can do the gig from 6-9. He agreed. We were there and set up by 6. There were 2 women in there setting the room up. So we decided to begin playing (that was the agreement right) People started mosying in there like 7:30. So after that, the birthday guy didn't get there till 8:45...everyones having a good time...so at 9:00 BAMMM!!! we ended our 3rd set and we started breaking down. So everyones like, where are you guys going?...the guy who booked us ran over to me and was like, can you guys stay another 45 min? I asked him for another $700, needless to say he couldn't afford it....while leaving, i told him "our agreement was from 6-9..and it wasn't my fault you or your people weren't here on time and we were", it was really funny.