What happens after week 9?

I don't know, but i expect a new draft caus 1 or maybe 3 teams are leaving/joining the LCS so that's 5 to 15 new players not mentioning the roster swaps of the staying teams.

I can't speak from experience but I believe it's a new league with a new draft. Because there a usually a good amount of roster changes going into summer.

I played last year, they just archive the leagues, you have to join new ones.