The Brewers Association
This association host a number of events including Home Brew Con, Great American Beer Festival and Craft Brewers Conference.
Their website states that they focus on
Eliminating waste from bottled water by setting up filling stations and encouraging attendees to bring their own reusable water bottle
purchasing carbon offsets for a portion of the energy consumed by the event
ensuring cups and service ware are recyclable and compostable
using seasonable and local food offerings wherever possible
asking about green programs at each venue, such as food donation for excess food.