Looks like the Koppenberg is on for August 30th. After being cancled twice Boulder Racing has picked a date. From the website:

Oh, yes, one more thing, we are CHANGING THE RULES. From here on forward the race will not be canceled b/c of mud. In the future, if the hill is unrideable, then the expectation is that riders will hike the bike up the grassy sides and remount on top. So this means it is highly recommended that if it is wet outside, you bring Mountain Bike shoes and pedals. We will investigate footbath options (seriously) on top of the hill in case of mud on the cleats before remounting.