A free jazz concert and airborne pyrotechnic show Saturday night at the conclusion of the three-day Arlington Fly-In will be a gesture of gratitude to the many Stillaguamish Valley residents who helped their neighbors deal with the effects of March’s disastrous Highway 530 mudslide.

“It’s a way of thanking community members for all the ways they stepped forward to help,” said Arlington Mayor Barbara Tolbert.

The Arlington Fly-In, which runs Thursday through Saturday, began in 1969 as a one-day fly-in and spaghetti feed. It has grown into one of the most popular aviation activities in the West, typically drawing some 55,000 people to the Arlington Municipal Airport.

The concert and pyrotechnic show will be free, courtesy of sponsors who stepped forward to make it happen, Tolbert said.

Admission to other events at the fly-in is $15 for adults who arrive by car and $10 for those who arrive by air. Youth 15 and under are admitted free, but must be accompanied by an adult.

More than 1,000 aircraft are expected, including powered parachutes, home-built planes, hot-air balloons, vintage and military aircraft and more.

In another connection to the mudslide, food booths will collect donations for the Cascade Valley Hospital Foundation.

Forty-three people died and many more lost their homes in the March 22 mudslide along the North Fork of the Stillaguamish River.

More information on the fly-in: www.arlingtonflyin.org

Jack Broom: 206-464-2222 or jbroom@seattletimes.com.