Pioneer Day Celebrant is a term used to describe someone who celebrates Pioneer Day in Utah. A Pioneer Day Celebrant can be referred to as either a Utahn (5 letters) or a Utahan (6 letters). Pioneer Day is an annual holiday celebrated in Utah on July 24th to commemorate the arrival of the first Mormon pioneers to the Salt Lake Valley in 1847. The holiday is celebrated with parades, fireworks, and other festivities.