The event takes place from 10a.m. until 5 p.m., rain or shine; admission is free.
Organized this year by Mary Ellen Ellwood and Patrick Mulcahy, the fair has been dubbed "the largest block party around," by planners.
"The fair is a great time for people of all ages," Ellwood said. "There is something for everyone. Lots of great food and drinks, and fabulous entertainment>"
Riverhead Townscape is the parent organization of the fair and all proceeds go to beautification projects around town.
This year, the fair features over 400 craft vendors, Business Expo 2013, garden tractor pulls, food, carnival rides and midway games for children.
With ties to Riverhead's rich past, agricultural, homemaking and needlecraft exhibits and competitions will once again be held, with over 200 categories to enter.
Animal rescue and civic groups will be onhand, as will a first-ever traveling museum from the Riverhead Historical Society.
Live entertainment will rock the Riverhead Showmobile along the Peconic Riverfront; performances will also be held in Grangebel Park. Some of the performances scheduled include: ReDancers, Acoustical Vision, Who Are Those Guys, Magic Beyond Imagination and Misspent Youth.
The fair runs along Main Street from McDermott Avenue to Griffing Avenue, along Peconic Avenue from the traffic circle to Main Street, and along the Peconic Riverfront.For more information about the fair and the various competitions, click here.