just looked on the site and it says this

Central RS Owners Club Day - 22nd April
Kids Under 13 FREE*, For more details www.centralrsoc.co.uk.
Ticket Type Gate Adv Grandstand
(day/adv) Gates
Open Track Fee
Sunday
£15 £12 Free 8am £15
3 runs
(Max 100 Adv


whats max 100 adv?? fr the runs mean? only the first 100 people?