Update - 7th August
Salesforce are unable to help us find a space, but they are offering us a budget of 500 USD to put towards food etc. which is great.
Hoping to secure a space through Salesforce themselves that may or may not come with catering. They've just closed the window for applications so hopefully I'll hear back in the coming weeks as to whether or not they'll be assisting us with a venue for a get together. If this falls through we should definitely try and find a space we can use, though they are getting harder and harder to come by at Dreamforce. More and more Salesforce partners have been sorting out their own spaces for hosting events and the like, so perhaps we could find a friendly company to host us if the Salesforce option falls through.