WordNet (r) 3.0 (2006):

bandstand
    n 1: a platform where a (brass) band can play in the open air
         [syn: bandstand, outdoor stage, stand]

Moby Thesaurus II by Grady Ward, 1.0:

33 Moby Thesaurus words for "bandstand":
   L, R, acting area, apron, apron stage, backstage, band shell,
   board, bridge, coulisse, dock, dressing room, flies, fly floor,
   fly gallery, forestage, greenroom, grid, gridiron, lightboard,
   orchestra, orchestra pit, performing area, pit, proscenium,
   proscenium stage, shell, stage, stage left, stage right,
   switchboard, the boards, wings