Historical clue formulations

• ___ Field, former home of the Seattle Mariners — 2019-07-08
• Seattle-based insurance giant — 2019-06-09
• Seattle's ___ Field — 2015-10-22
• Its parent is Liberty Mutual — 2014-04-12
• ___ Field (where the Mariners play) — 2011-01-13
• Seattle's ___ Field — 2010-04-25