Yeah I could see if you went to a forum and the whole first page was sticky's that might be frustrating.
I was just thinking that if there was one in each Regional Gardening Forum, local members who would have knowledge of events could post them. If there was a moderator then after the date had passed they could be marked as "Done". I think one big calender for the whole site would get frustrating, since you'd have to wade thru dates for events that weren't in your area.
