Usually, if this is a single night event, they would not pay more than $250-300 for the flyers being printed. This does not include designer fee. I would ask anywhere from $50-100 and that would be fair. I estimate it'd take you anywhre from 2-4 hours to complete this.

I used to do this on a frequent basis and depending on the event, I wouldn't ask for more than $100.

Some tips:
Make sure you get the correct template (size) and make sure they specify if they want it in CMYK or not..