In yesterday's Yammer webinar, the "Galactic Collaboration Summit 2020" was advertised. The URL for registration is https://www.collabsummit.space. It is unfortunately being flagged as a source of malware and those interested cannot register.
@Emy Loanzon That site seems to load for me, but I think it's operated by a third-party and not Microsoft. It is probably worth trying to access it from a personal device in case your organization is blocking the URL for some reason. Sometimes security software miscategorizes sites.
If you continue to have issues you might want to reach out to Spencer Harbar over at https://twitter.com/harbars since he's listed on the organizers page.