Oakland’s Mosswood Meltdown returned to Mosswood Park with a shiver this year, cloaked in a bizarre July chill. Given the gloom, the ongoing pandemic, gun violence and political turmoil, the collective gathering on Saturday and Sunday for the sake of punk and its subversive thrust felt a little more desperate, a little more defiant. Following the reversal of Roe v. Wade a mere week earlier, Flipper’s throat-shredding delivery of “Life Is Cheap” and Bikini Kill’s ever-powerful performance of “Feels Blind” blistered with new meaning.