When to take rave supplements?

Hoping for some help with harm reduction. Recently bought some Soft Landings recovery sachets and plan on rolling 2 separate days with a day break at a multi day festival. Ive read that you should not take 5-HTP before rolling but exactly how far before is not a good idea. Should I wait until the festival is over to drink the supplement or is it safe to have one after each night on the town?