Historical clue formulations

• Bishop's group — 2022-04-09
• Group to which Don Rickles joked he "never received an official membership card" — 2021-09-11
• 1950s-'60s entertainment group — 2021-01-06
• Group in the original "Ocean's 11" movie — 2018-09-26
• Bishop's group, once — 2018-03-18
• Group in the original "Ocean's 11" — 2018-03-09
• "Ocean's Eleven" cast members — 2001-10-26