Another day, another paid appearance by Patriots party boy Rob Gronkowski. Thursday, Gronk handed out free ice cream to passersby in Downtown Crossing as part of a DraftKings promotion. Friday, the Pats tight end showed up at Tony C’s Sports Bar & Grill to lead an aerobics class as part of a promotion for Oberto Beef Jerky. Outfitted in a neon ensemble, Gronk showed off his dance moves and delighted the crowd by spiking a bag of beef jerky.