Without doubt there is a lot of interest in the C5, but when you ask people to pay for stuff it becomes a different ball game. If you're going into the rental game, you will have to meet certain legal requirements such as public liability insurance. Compiling a suitable risk assessment to satisfy the local council may also cause its own headaches. I'd expect this day and age you will need some sort of permit/licence.
Then you will need to decide how many C5's you will be running, and what their running costs will be - plus expect some damage to be caused through accidents/abuse etc.
Not saying it can't be done, just that you need to do a lot of research to ascertain if it is economically viable.
We allowed people to use our C5's at Brooklands recently, but the museum covered the liability insurance , first aider requirement & risk assessments. There was no fee for the ride - simply a £1 donation straight to the museum.
I reckon the best possible use for your C5 is to come along to the meetings and enjoy yourself