The 4th Annual Blackfoot River Challenge is exactly what it sounds like, a three-day paddling-palooza, with clinics on Friday, a 10-mile downriver race on Saturday and slalom races on Sunday. Proceeds benefit the Missoula Food Bank. $10 for clinics/$5 with food donation. $20 per event or $25 for more than one (bring along some non-perishable food items, too). Visit blackfootriverchallenge.blogspot.com.