Historical clue formulations

• Like sports stadiums susceptible to rain delays — 2024-11-03
• Like some markets — 2022-07-27
• Outdoor — 2020-11-29
• Lacking a roof — 2013-02-26
• Like some markets and headphones — 2012-05-26
• Like a classical Greek theater — 2011-07-14
• Unprotected, in a way — 2008-04-05
• Alfresco — 2005-12-01
• Like some markets — 2005-01-28
• Like some concerts — 2001-12-04
• Unroofed — 2001-06-17
• Kind of concert — 2001-06-09
• Kind of market — 1997-08-01
• The outdoors — 1995-11-08
• Kind of market — 1994-05-28
• Outdoor — 1994-05-23