I think these are the two things we should probably figure out before starting the next tournament.
Part 1
The tournament suggestions thread is old, and it seems to be filled with ideas made for long-forgotten times by long-gone people. I'll try to list them all here, along with reasons why I think they're on the list. The banlist is outdated on almost all of them, so that's the reason if you don't see any others.
Ninja's Annoying Woodland Creature Tourney (the new Route 1 completely ruins the "spirit" of this tournament)
Pina Coladas's Generation 3 OU Tournament (ORAS was already released)
Torterra02's TechniciMons Tournament ("allow list" also seems outdated)
Pina Coladas's Little Big Cup
~Wolf~'s Mega Showdown Tourney
<%7CSkymin%7C>'s ORAS megas tournament (ORAS was already released)
mew2002's Alpha and Omega Tourney (ORAS was already released)
Additionally, a few tournament ideas were made for long-forgotten times, but not made by long-gone people. These ideas were from users active less than a year ago, and they can possibly still be responsive enough to update these ideas.
MrKijani's Battle of the Titans
trachy's Mixed Tier Mono-Region Tournament (made for 5 regions and 16 people, neither of which are true now)
Sir Dan's OU Monotype Changing Tournament
A few of these can still be played with a slight adjustment to their banlists, but I honestly think most of them should be hidden and possibly forgotten forever (at least get rid of the ORAS ones). Do you guys have any better solutions?
Part 2
As most of you know, Pokemon battling tournaments are parasitic organisms that need hosts to survive. When a tournament finds a host, it takes residence in the host's digestive system and grows at the host's expense. Unfortunately, we seem to have a lack of expendable hosts, so I propose making the hosting process more organized somehow. My idea was to let people comment on answers in the tournament thread, sometime during or after the previous tournament, to claim host status for that tournament. The host should have enough free time to check his/her/its tournament thread every day for however long the tournament will last, and doesn't need to participate. People should also participate in at least one tournament before they try hosting so they sort of have an idea of what they're doing.