Shall do thank you!
Not "If" we have a meet as this is a regular event run by CITP (Cars in the Park) - full details have been added to the first post.
Not sure about the raft and the swings but it is a normal ticket at a discounted price. Cars in the Park is sharing with the flower show and that usually means more people and cars. If you go to the CITP website you can see photographs from all the previous events.