just to say: that's Columbia - she attends every parade, march, or other pre-announced large gathering that walks down an NYC street. usually, as shown here, as part of the tail or sideline contingent. and very much regardless of its politics: a bit of googling should find you shots of her at the Salute to Israel parade (which welcomes openly racist groups like Betar), the openly anti-queer St. Patrick's Day Parade, etc etc etc. so i'd be a bit hestitant to assume she's there in active support of the May Day march's goals (rather than in general support of crowds walking down the street) unless you spoke with her about it - though i certainly hope she was.