Whether its a calendar that's stated outright someplace on site, or simply a certain week or month (other than Black Friday) when sales tend to crop up every year. I'm trying to figure out future purchases. Thanks!

(If there's no such thing and it's just a matter of waiting, that's totally cool. Just wanted to know.)

It's just whenever staff feels like having a sale

I don't think there are any actual sales, apart from the BF sale. There's just the bonus CSC / items for a short period of time when you buy CSC with $$$.