Penn Treaty Park will be abuzz for another spring-ish day as it hosts the annual Fishtown Shadfest. And while local arts and craft vendors sell their wares, Philadelphia Brewing Company will serve their brews and host the Kenzinger Challenge Run, and you have the chance to enjoy a shad sandwich from the chefs of Standard Tap. Philadelphia Rollergirls and WXPN have joined forces to showcase an afternoon of exciting music. First the bad news, Grandchildren had to cancel their anticipated appearance last minute. But Asteroid #4 and Mondo Topless alum Jamie Mahon and the rest of his psychedelic garage rock outfit St. James & The Apostles will be taking their place. And today will still be the last chance to catch Buried Beds before they tour alongside local natives and pals mewithoutYou. York Street Hustle will be headlining with their soulful jazz beats, while the Citywide Specials will be kicking it with some country bluegrass twang. And come out to support Girls Rock Philly and Rock to the Future as they give you a proper glimpse into the future of local music. Penn Treaty Park, 1199 N. Delaware Ave., 12pm, Free, All Ages – Bill McThrill