GILT OFFLINE: Off-price e-tailer Gilt Groupe will host a New York warehouse sale on May 18 and 19 at the Altman Building. The event will offer men’s, women’s, children’s and home merchandise taken from Gilt warehouse stock at up to 80 percent off suggested retail. This edition will be the first time merchandise from Park & Bond, Gilt’s full-price men’s site, will be included in the sale. The warehouse sales have become a favored outlet for Gilt to unload inventory in a brick-and-mortar setting. Shoppers must buy tickets for specific time slots, which went on sale Monday on Gilt City for $10 to $20. Top Gilt customers received a special invitation to shop the sale prior to the public.