Google calendar entries

Is it possible to create an alert (trigger) based on the calendar so that it will turn a light on , a couple of hours before the event takes place.
I don’t understand the options in google calendar

You could have Google Calendar send you an email alert a couple of hours before the event and trigger on that.

Thanks , but that is not an option as the calendar entries are not owned by me , but are generated by a sports club for the whole season.

Reading the calender entries are sufficient

Thanks , can you please expain what to do.
Btw the gmail trigger is no longer supported I think