so if miss out on seats can you turn up on the day? to buy in or is that it?
Yes you can of course still turn up on the day and:
a. Hope the event is not full and therefore get a seat on the day, or as a late entry if you don't arrive before the start but do so before the start of Level 4
b. If the event is full then add your name to the Alternates List (reserve list) and hope a seat becomes available for you (as people get knocked out) before the start of Level 4
Cheers/Tom