Last summer I booked two jobs the same night, forgot to put one on my calendar. The people called at starting time, 6:00, wondering where I was. I got there at 7:00, called the other place and told them I'd be there at 10:00. I cut both jobs short an hour. I told both of them they didn't own me anything, but they both insisted on paying.
I also went to a nursing home and forgot my keyboard! I hooked up the laptop and did karaoke. They loved it.
DonM