If you can't catch Canadian folk rockers The Sheepdogs at Algonquin College in March, you'll get another chance to see the band -- for free -- in June.

The Sheepdogs have been announced as the headliners at the Tim Hortons Ottawa Dragon Boat Festival on Friday, June 20. It'll be their second appearance in Ottawa this year; they also have a gig at the Algonquin Commons Theatre on March 14.

The Saskatoon natives will join roots rockers Cuff The Duke and indie folk band Harlan Pepper at the festival.

The Sheepdogs rose to fame with their 2010 album Learn & Burn, then won an international competition in 2011 -- decided by 1.5 million votes -- making them the first unsigned band to appear on the cover of Rolling Stone. The band went on to win three 2012 JUNO Awards: New Group of the Year, Single of the Year and Rock Album of the Year.

The dragon boat festival is based at Ottawa's Mooney's Park and runs from Friday, June 19 through Sunday, June 22. It's the largest dragon boat festival in North America, with more than 200 teams expected to compete in several recreational, corporate and competitive divisions.

The non-profit event offers free admission to concerts, as well as a variety of artisans, exhibitors, delicious culinary treats, beachside bar, children's area and non-stop dragon boat racing.

It has raised more than $2.9 million for several area causes.

The festival will continue to name more performers to its music lineup over the next few weeks.