Scott Alexander promotes a charity event, encouraging donations to MIRI or Sankara Eye Foundation to help them win valuable services.
Longer summary
Scott Alexander is promoting a charity event where the organization with the most unique donors of $10 or more by midnight wins valuable services. He encourages readers to donate to MIRI (Machine Intelligence Research Institute), which works on ensuring a positive singularity and friendly AI. MIRI is close to the top place with only a few hours left. Scott also mentions the option to donate to the current leader, Sankara Eye Foundation, which provides eye care for poor Indian children.
Shorter summary