When a google calendar entry of "Smarthome Vacation" is found set the comfort profile on Ecobee to Vacation

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

Set thermostat comfort profile until next transition

This Action will set the thermostat into a hold using the settings from the specified comfort profile. This comfort profile hold will remain in effect until the next next comfort profile transition in the program.