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Not possible without third party integration, but I can think in a walk around something like this, very sketchy,
Create a record with the name of the event and its email address
Create a score field for the event
Every time that someone gets registered trigger an alert to the event email address
Create a smart campaign with the smart list trigger "sent alert" with the flow change score for the event in +1
Create smart campaign that once the event record reaches score 950, trigger and alert to you...
Try and share