The authors of If Anyone Builds It, Everyone Dies: Why Superhuman AI Would Kill Us All are calling for a march in Washington DC (the "Don't Build It march") to call for an international treaty to ban the development of Artificial Superintelligence. The organizers are collecting pledges with the wording "If 100,000 other people also pledged to march in DC, I will attend that march", with the stated intention of only scheduling the march if they receive 100,000 such pledges.

Will the march happen before the end of 2026?

I will not bet on this market.