Dress like a Cossack—and drink like one too—at the Linnaean Libation League’s Event No. 6: Russian Retreat. Flavorpill sponsors this wintry soiree promising warming tipples, hors d’oeuvres and songs played on an accordion-like bayan. New Yorker short-story writer Lara Vapnyar will read an ode to the country’s forest landscape, while garden staffers explain the botanical origins of vodka. We suggest toasting to the Old Russian New Year, which is today, according to the Gregorian calendar.