2017 Marietta Greek Festival. 3 p.m. to 11 p.m. Friday, 10 a.m. to 11 p.m. Saturday, 11 a.m. to 6 p.m. Sunday, May 19 through 21. $5 for adults, free for children ages 12 and under. Holy Transfiguration Greek Orthodox Church. 3431 Trickum Road, Marietta.