I'm also curious to hear if/when you think sending an email to all students is a bad idea, or if other ways to reach people might be more effective. I recently worked with Jack Ryan, Mauricio, Nikola Jurkovic, Fiona Pollack, and a few others to send an email to MIT and Harvard students, but I'm curious to hear others' thoughts and don't want to anchor people. I'll add our email after a few days. (I also realize I should've probably asked around before sending our email, but we were pressed for time).
Perhaps this goes without saying, but please also (strong) upvote ideas based on how good you think they are, and explain why.