How old are you? Over 35 will let you into Senior Open at 11am,
Middleweight Twins mixed race at 11:30,
you can put your money in for Fast 25 (only 19 gridded last time, so you could've been #20) at 11:45,
Intermediate Open at 1pm,
Formula Thunder at 1:50,
Intermediate Supersport 600 right after at 2:15,
and Intermediate Superbike at 4pm.
For sure you'll be in the fun if you're entered into Mid weight Twins, Int Open, and Formula Thunder. I have no personal experience with the others except for senior open and use it for start practice and a good warm up for the day. I judge my morning progress by where I start to get lapped! Last round was much closer to the end of the race than the usual 1/2 way mark.