Guerlain will sell their annual version of their Muguet (lily of the valley) fragrance, as always, on May Day (May 1st):
April showers bring May flowers and the month of May signals the advent of one of Guerlain's most anticipated annual scents. Guerlain's Muguet fragrance is an embodiment of the freshness and loveliness of spring's arrival, celebrating this season of love and honoring the unique blossoms for which May is known.
Guerlain Muguet 2011 will be $580 for 100 ml, and can be found on May 1st only, at Guerlain boutiques (Palazzo or Bellagio in Las Vegas, Saks or Bergdorfs in New York City, Epcot or the Breakers in Florida, Neiman Marcus in San Francisco). (via press release)