I like to know about a week out. Busy schedules on both sides of the hobby make planning difficult. With short notice like one or two days, I might already have plans set in stone.
Also, change days up from visit to visit. Some of us have play time during the week and some on the weekend. Just like any self employed entrepreneur, one must cater to the needs and wants of the public. If I want to sell steak and potato dinners but only from 6am to 9am, my clientele will be very limited. Just food for thought. (Pun intended )