All vendors participating in special events are required to obtain a Temporary Sales Tax License and Special Return from the Utah State Tax Commission. What is the timeline to apply for a permit?Looking for exciting events, annual festivals, and family fun in Salt Lake City? The permit process for a Special Event Permit begins with the applicant completing the online application and submitting it. An EVENT PERMIT APPLICATION must be submitted to the Utah County Public Works Department at least thirty (30) days prior to such event.