Question regarding NMC shows?

I'm still awaiting a response from the NMC regarding membership, and hopefully I'll get one before the next show (I think Sale, in April?), but just in case I don't, I thought I'd ask here.

Are members of the public allowed to attend the show, or is it members only? Asking because I would love to be able to see a show or two before I start anything with my own mice, just to get myself an idea of how they work, and possibly meet up to buy some mice if I can source any.

Otherwise, is it possible to join on the day, at all? That'd work for me, too.