Historical clue formulations

• Word with letter or grant — 2026-09-12
• With 63-Across, gathering for this puzzle's attendees — 2025-12-31
• Tetris piece — 2017-08-06
• The 2x2 black square near the middle of this puzzle's grid, e.g., which is part of eight answers — 2010-10-21
• Jam — 2006-10-21
• Veto — 2006-06-07
• Lego unit — 2004-04-28
• Literal element of eight answers in this puzzle — 2003-08-14
• City division — 2002-10-15
• Urban area — 2000-03-26