The Sumac Centre has a completely vegan cafe and bar run by volunteers. As it is registered as a Social Club, you have to be a member to be there during licensed hours, though it is easy to get someone to sign you in as a guest. The opening hours are limited and subject to availability of volunteers, so check beforehand. Beer costs about £1.90 a pint.
Food service is currently limited due to a lack of volunteers (why not help?). There is a People's Kitchen meal served every Saturday from 7pm for a donation of around £3.50. The bar is open on Friday evenings and there is sometimes a brunch served on Sunday morning. There are also other events - check the Sumac Centre calendar for details.
The Sumac Centre is based in the Forest Fields area of Nottingham, about 2 miles from the City Centre and easily reachable by bus and tram.