Many of the bigger events in Provo have their own web pages. You can see current events in the calendar as well. I've linked to web site calendars in the calendars subdirectory
Days of 47 (www.daysof47.com) - review The Days of 47 page by KSL lists Pioneer Day events and activities.
Stadium of Fire (www.stadiumoffire.com) - review The Stadium of Fire is an annual festival that includes fireworks, live music and fun.
Utah Brazilian Festival (www.utahbrazilianfestival.com) The Utah Brazilian Festival takes place in August.
Lucky Duck Derby (www.luckyduckderby.com) The Lucky Ducky Derby is a benefit event for the boys and girls club. It takes place in August.
SpinGo (spingo.com) SpinGo is a site that aggregates information about events.
White Ginger (www.whitegingerevents.com) White Ginger is an event planner from Provo.