Osprey is encouraging the participants in its Happy Hour on Day 1 of the Summer Outdoor Retailer trade show to bring their own reusable pint cup. For every reusable pint cup that they bring, Osprey will fill it with beer and make a $6 donation to Big City Mountaineers. Osprey's Happy Hour at Outdoor Retailer will take place on June 18, from 4:30 pm – 6:00 pm at the company's booth. The trade show will be held in Denver, Colorado on June 18-20.