Historical clue formulations

• Workers who sing the opening number in "Frozen" — 2026-02-26
• Ones working block by block? — 2021-08-01
• Occupation for the Three Stooges in "An Ache in Every Stake" — 2020-06-19
• Bygone deliverers — 2018-02-25
• Old block deliverers — 2012-01-29
• Workers skilled with tongs — 2003-06-12
• Onetime delivery people — 2002-12-12
• Pursuers of goals — 1999-07-22
• Old-time deliverers — 1998-10-06
• Canadiens and Canucks — 1998-09-27
• Rink caretakers — 1995-07-08
• Onetime refrigerant suppliers — 1995-05-23