I'm not sure what you mean by an "event day". There hasn't been an event scheduled of a VPP day in my app, and there is so much excess capacity at the moment, that I think one is unlikely. Check Casio.com for demand and usage;
View attachment 956374
That's an extra 9 billion watts of available power above the forecast peak demand, with tomorrow in the same ballpark.
Barring a system wide failure, I agree with
@Redhill_qik that we aren't likely to see an VPP event called until August/September.
All the best,
BG