If you have missed LSK’s classes. You can find other options here:
City Festival Instructor List

Any business preparing, serving or sampling food at temporary outdoor events is required to have at least one worker with a Summer Festival Certificate in the booth at all times.  Training must be renewed each year. 

You must submit a health inspection of your kitchen with applications. It must be no more than 6 months old. To request an inspection, email food@cityofchicago.org.

Businesses exempt from this requirement are: cooking food trucks, vendors that dispense packaged food, and farmers market vendors that do not sample food on site.