I think that you should add an invite all for tournaments in groups! For my small group (~70 members) it is a hassle for me to invite every single player. Inviting everybody helps to boost tournament participation, but it takes a long time! This would probably be a even bigger issue for large groups (https://online-go.com/group/25)!
Were you going to invite every 9942 members that are in the Go Basics group to your tournament? Good Luck
*9943! And I was actually trying to fill this tournament up https://online-go.com/tournament/59570 (Actually no, I was just trying to make inviting everybody in a group for a tournament more easy!)