Gran Sierpe Pisco Bus One Year Extravaganza on Thursday, September 30, 2010.  The legendary ‘Pisco Bus’ celebrated its one year anniversary on September 30th: wearing pants, optional. Gran Sierpe Pisco, Yelp and the Miami Rescue Mission formed an invigorating partnership on this venture.   Giving Back In honor of the one-year anniversary, Gran Sierpe had decided to contribute to a greater cause. Gran Sierpe will be asking all males to donate their pants to the Miami Rescue Mission, making this month’s festivities a bottoms-optional occasion. The non-profit organization for the homeless has recently expressed its urgent need for this male attire, inspiring the philanthropic theme for the evening.