Schedule for Event Security

I'm looking to apply for a part-time position for Event Services as an Event Security at Allied Universal Security, but there's no set schedule like regular security postings. There's not even information stating expected days that I would be working or if it's a pick up shift system, there's no info on how many I am required to pick up in a month or so.

The position type says "Position Type: Flexible - Events Division" as regular postings say full-time, part-time, or flex. The location is at a large football stadium home to an extremely popular football team in the NFL. The listing says I'll be dealing with football games and concerts

Please let me know if you know what is expected in the events division for AUS!