I don't have access to the article content beyond the headline and source. The snippet provided only shows:
- Title: "8 Celebrities Who Are Either Boycotting or Banned From the 2026 Met Gala" - Teaser: "Don't expect these stars to walk the carpet." - Source: Cosmopolitan
To write an accurate summary following your guidelines, I need the full article text listing which celebrities are boycotting or banned, their reasons, and any relevant business or industry context.
Please share the complete article content, and I'll deliver a sharp 150-250 word summary with proper formatting.