Historical clue formulations

• Christie's event — 2020-02-23
• Gallery sign — 2017-12-19
• Christie's event — 2016-08-05
• Gallery sign — 2015-12-25
• Where prints may be picked up — 2014-07-13
• Gallery event — 2014-04-25
• Where to check for prints? — 2013-07-05
• It may offer a variety of oils — 2010-08-07
• Gallery event — 2009-08-30
• Discount oil source — 2005-11-18
• Gallery sign — 2005-09-02
• Gallery event — 2005-01-20
• Picture show? — 2003-08-17
• Low-cost oil venue? — 2002-09-06
• Gallery event — 2000-07-19
• Gallery event — 1998-05-24
• Gallery event — 1998-02-01