We were using Wednesday nights as a training night, although due to schedule issues during the week there wasn't generally weren't many of us on.
Our "official" squadron nights are Saturdays and Sundays at 8pm EST/7pm CST (sort of a, "can't get a consensus on which is best so screw it we'll make it both" thing, lol). However we join up any time there's a couple of us on, which there's usually SOMEONE on, especially in the evenings, throughout the week. As I mentioned before, we also intend to begin regularly participating in scenarios and snapshots requiring F4U drivers.
Really, the only important criteria we have is a love of the Corsair, and an interest in teamwork. We've never established any sort of structured "try out."