I'll go first:

• Libs will suddenly discover that there's concentration camps in Gaza. This will lead to one protest with cheeky signs.
• Someone assassinates a prominent politician (not Trump)
• McDonalds' releases a new burger, which Trump tweets about.
• John Bolton releases a new book.
• Trump inflames tensions with Indonesia or Mauritania, suddenly everyone is a geopolitical expert
• Trump pledges to give more weapons to Ukraine after meeting Zelensky. Stops all support after meeting Putin, pretends not to have made the previous pledge.
• Trump will do a minor goof which libs will bring up for the next four years. His supporters will carry around comfort blankets to show support