This is on the FAQ page:
Do you sell a Designated Driver ticket?
Yes, Designated Driver tickets are available for all sessions for $25 each. Free, non-alcoholic sodas will be available and each Designated Driver receives a complimentary gift, available in the Designated Driver Lounge. Designated Drivers are welcome to attend the beer and food seminars, walk around the festival floor, or relax in the Designated Driver Lounge.
I'm glad they still do the DD ticket. One of the things that bugs me about the VT Brewer's Festival is taking away the DD option. They even used to allow kids on the Saturday day session, with games, soft drinks, face painting, etc. Not any more though.