Thanks for all the feedback, I have a few further points after a week of fermenting the idea.
a) people in a social / community mindset are very unlikely to have a lot of cash to spend on coworking, They have to work on the cheap.... but in providing them with an affordable space to operate there are tangential benefits such as word of mouth advertising and consumable sales e.g. coffee etc.
b) freelancers and small companies that are not working on social projects or community efforts. Should not be able to use the spaces for there regular work for an extended period of time (i.e. a short introductory client meeting would be ok, spreading out and working on a clients project or having an extended client meeting would not) . ... this is the line. ... but I think most freelancers would be ok with that. the ones who wouldn't , wouldn't pay anyway.
c) there must be designated areas for the social/community spaces and these should double up as the break out / lounge / welcome spaces.
d) There should be a discounted rate for use of the full spec spaces for recognized charities and non-profit groups.
Most importantly (should never be overlooked) helping people get things done, is what adds value. If it adds value It can have a price.
Helping people socially either find work or make the world go round through resource sharing is a massive part of coworking, but it does have a cost.
Thus: If the coworking is starved of fuel (paid sales) everyone losses. So there always needs to be a commercial element to everything ...
I'm now thinking that while jelly is conceptual free. A token annual fee to attend events would offset the minor costs associated with running the events.
Thinking 5 x 12 = 60 .... say make it 50£/$/E respectively
The alternative is sponsorships ... would companies pay the 50 per person for 12 exposures to their product or branding?
...What do you think.... Waste of time or a possible solution to the problem of not making a loss running these events and still adding value to the jelly attendees?