Wrong date given

I have just found out I have been given the wrong date for a craft fair. Brooklyn House booked me in for a fair back in March and sent a confirming e-mail. I waited for the follow up e-mail which did not turn up, so called in to day only to find out the date had been changed to last week. There were about 5 stall holders from our group that had not ben informed. As you can imagine I was quite cross as I could have perhaps booked some thing else .I now have a Saturday afternoon to sew for next week.
WHAT SHALL I MAKE ???