BELFAST — They are masterpieces on macadam, portraits on pavement, creations on concrete. Call them whatever you will; all are unique, and often spectacular.

The Belfast Chalk Walk, co-sponsored by Waterfall Arts and WERU, returns for a sixth year along the city’s waterfront on Sept. 10.

“I look forward to this event every year,” said Waterfall Arts Kids and Families Outreach Director Bridget Matros, who heads up the annual effort. “It’s a perfect opportunity to be creative, to step into the stream of history and tradition, to join other artists, and to meet people passing by that are viewing your process.”

Artists must register with Waterfall Arts for one of the 30, 4-by-4-foot squares along the Harborwalk, Steamboat Landing and throughout Belfast. Registration is free and participants will be provided free chalk, rags and knee pads, along with tips and other resources for artists new to chalk. Kids, families and novices are encouraged to participate in this unique event.

Belfast Chalk Walk returns for its 6th year on Sept. 10.

“New England doesn’t see many chalk festivals,” Matros said, “so most artists are novices. Anyone who enjoys drawing or painting in likely to fall in love with large-scale chalk drawing.”

Artists under the age of 15 are encouraged to register for a 3-by-3-foot spot, with up and comers encouraged to draw in the community drawing area.

This year the creative process will be accompanied by music, courtesy of WERU. Roy Davis and the Tusk Audio Sessions Band, the final artist in WERU’s Summer Concert Series, will perform in Heritage Park during the event.

Those interested in participating should contact Waterfall Arts, or visit their website, to register.