question

Planning for my first track day ever this year and noticed the novice class is listed as free and first come/first serve. - Do I really just show up and pray or is there some other registration involved? - How do I find out which track days offer an intro class? - Is intro usually packed or...

Couldn't find an answer on the search function, sorry if its already been answered. First N2 track day and first road Atlanta track day, do they sell/mount tires on site? or do i need to order some ASAP? Thanks!