Historical clue formulations

• One who's definitely not being invited to the party — 2026-08-13
• Untouchable — 2026-03-26
• Persona non grata — 2024-05-11
• Outcast — 2020-09-22
• Social outcast — 2020-03-03
• One who's blackballed — 2019-01-05
• Outcast — 2018-04-27
• Persona non grata — 2009-06-16
• Unwelcome one — 2000-04-09
• Persona non grata — 1999-08-23
• Outcast — 1997-11-03