Create new Google calendar, and make schedule.
If
Event from search starts
This Trigger fires a set number of minutes before the starting time of an event on your Calendar that contains a specific keyword or phrase in the event’s Title, Description, or Location. Ingredient will be based on the zone set in Google.
Then
Turn off
This Action will turn a WeMo Switch off. If the WeMo Switch is already off, it will remain off.
Discover more time saving integrations for Google Calendar and WeMo Smart Plug