If the event operator needs you for past the shift time, you will need to submit a shift modification via the Game-day section of the Go4Ellis app.
First, make sure you are checked in for that event on the Game-day section. Once the shift ends, you may request a shift extension in the upper right hand corner in the Game-day section. Your shift extension will be sent to the event operator for approval. Once the event operator approves your shift extension request, you will be paid fully for the shift you worked.