Clean up as in re-grade maybe? Depends on the season, but I imagine events would produce a lot of wear and tear. I like the fairgrounds though, it's very nice, I do not want to participate anywhere there are boulders.
SCCA regions pay pretty significant rental fees for autocross sites, as far as I'm concerned, considering they're just renting out parking lots for the day. I'm not in the know, though, or in a position to volunteer for this. Need to trailer the WRX to some events to get my feet wet this season.