When does Santa come to Walmart?

My friends and I want to take a picture with Santa. Yes, it sounds childish, but we took a funny photo last year with when we where christmas shopping, and we want to do it again. The problem is, we don't remember what day that was. I live on an island, so Walmart is the only store in my town that takes free pics with Santa.

What day and what time does picture taking take place?