Almost everyone famous except for the "top" people in each field has a "day job", so it's not at all unusual to see them outside of the venue they're famous for working some regular career. For example of the popular death metal band Skálmöld, one of the singers is a preschool teacher, another is a taxi driver, etc. Their music seems particularly popular among teachers and schoolchildren; at least one school has held a Skálmöld day where the young kids showed up in their best death metal gear and listened to their music.
The country is incredibly child-friendly, both in terms of laws and culture. I've seen kids playing around the prime minister's table while a party speaker discussed tax policy. I've seen 2-6 year olds dancing in the front row of a heavy metal concert.
Daily Kos: How We Do It Over Here: Iceland vs. America