Clinics are the best/most fun/safest way to become familiar with the track.
While you don't need to attend a clinic to start racing we can't recommend them enough as it as it is a great way to learn track and non-track specific skills.
When are they?
Typically monday clinics start in April and run through July. They start at 6:00pm.
There also are a few weekend clinics too.
Check Northbrook Cycle Committee (NCC) website for specific dates.
There are no clinics on holidays.
If there is bad weather check @edrudolphvelo on twitter. If there is no cancelation tweet then there is a clinic.