Aoi Matsuri Boston Pops (First week in May through middle of July) Downtown Hoedown (Second weekend in May) Feast of San Isidro the Farmer Flores de Mayo (May)Celebrated in: El Salvador, Philippines International Bar-B-Q Festival (Second weekend in May) Lemuralia (May 9, 11, 15) National Family Month (Second Sunday in May through the third Sunday in June) Race of the Ceri St. Dymphna's Day Tulip Time (Second weekend in May)