sorry to ask Even More Questions but. theres so much new stuff

1. how do i know which cards are limited, including past cards? will it say on the description? i havent been able to find how to identify a limited vs a normal card :|

2)how oftenare event cards added to the michelle sticker shop?

3. how often are dreamfes gachas? is there a pattern?

4. how long is between events normally?

if anyone has any answers i wouldbe really greatful!

edit: also if anyone has any teambuilding tips for getting scores that clear the goals to get the banners and pins i would very much appreciate any help i can get :,) like which songs are best for getting a high score n stuff