If you mean a power pass, and I am assuming seasonal is the same, but an email to Universal is a good way to be sure.
From Orlando Informer, Universal's 2018 Summer Concerts page:
Power Passes: guests with Power Passes, please note that your admission to Universal Studios Florida is blacked out from June 13 to August 13. However, on concert dates, your pass is valid after 5:00 pm. This means you can attend the June 13th Huey Lewis and the News performance and/or the June 20th Goo Goo Dolls finale concert. (Just don’t expect to have a front spot!)