Historical clue formulations

• Invigorate — 2026-09-03
• Rev up — 2011-04-02
• Pep up — 2010-10-29
• Pep up — 2006-03-08
• Perk up — 2005-02-03
• Pep up — 1999-05-24
• Make it keep going, and going, and ... — 1994-03-04