I think there would be value in having some dates decided more than a month ahead of time.
The reasons I think so are:
- When potential hosts ask about hosting (as several have done recently) they ask for a date on when the next one is. They can then decide if it works for them or not
- Having a date allows less uncertainty for both the venue sponsor and the organizers’ personal schedule
- If closer to the date, it becomes necessary to change it, that can always be done!