Probably the closest to me is the Arbor Day celebration tomorrow at the arboretum. In September, within an hour or two's drive, we have a honey festival and a pawpaw festival - both of which have stayed true to their founding principles instead of turning into tacky flea markets as so many local festivals do. I've never been to the tomato festival (in the purported birthplace of tomato cultivation) or the blueberry festival. The one time I went to the violet festival years ago it was nothing but flea market, not surprising since I don't think there's any more commercial violet agriculture in Pickerington, though they've announced some better known musical acts for this year. Then obviously there are the county fairs and state fair. But as far as phenomena, rather than agriculture/horticulture/husbandry, around here it's institutions that put on events, not political subdivisions. So like the observatory has open telescope nights now and then, and special viewing events for things like comets or eclipses, or various lodges might have fall color events, etc.