I live 3 hours drive from any Bonsai club so I would jump at the chance In fact I am jealous
I am sure they will welcome you well. There will be other members with trees like yours.
But Why not turn up with no trees the first time. There will be plenty to see and hear. Members don't always take trees with them to meetings.
I have been to one of Canberra's clubs meetings and I didn't need a tree with me to enjoy the experience.
I guess you are keen to get some advice on your trees so it is up to you but you will learn alot in any event and you can organise to jion in a workshop with your trees at a later meeting