Historical clue formulations

• One on a registrar's list — 2019-06-14
• Course registrant — 2019-04-07
• Course participant — 2017-09-02
• Sign-up — 2014-05-04
• Signer-upper — 2011-01-18
• Student — 2010-10-03
• Program participant — 2001-12-29
• Signer-upper — 2001-09-02
• Official class member — 1996-11-13