Unplanned outage timing is never good but this is really not good.
https://www.salesforce.com/dreamforce/
Sept 15-17
https://www.salesforce.com/dreamforce/
Sept 15-17
They've gotten a little better in recent years.
Something I wonder about is whether SRE responses were delayed due to having to be emergency-change-approved because Dreamforce was on. I don't recall a global outage ever occurring during a change freeze when I worked there, so /shrug.
Also see: Oracle