On Wednesday nights after the two-hour show, whose short run concludes Sunday, GALA gives tango lovers a bonus, inviting them to participate in the milonga. Covid-19, among its other, more calamitous outcomes, wreaked havoc with our sense of security in public, with our understanding of the geometry of connection. Shaking hands suddenly became a death-defying act. So what of dancing again, cheek to cheek? Like tango itself, born in Argentina as a musical form of defiant self-expression and intense passion, the physical exhibition on this night by pro and amateur alike seems a call to life again — a declaration of freedom.