105 CMR, § 170.248
All services shall provide written notification to the appropriate local jurisdiction(s) of all provider contracts they have for primary ambulance response within the service zone. Services shall provide notice to the local jurisdiction(s), at minimum, when an initial provider contract is established, a provider contract is terminated or renewed, or any changes are made to the provisions of a provider contract relating to emergency calls. For contracts to provide coverage at special events including multi-jurisdictional special events, at venues with which the service does not have a prior existing provider contract for primary ambulance response on a regular basis, advance written notice shall be provided to all local jurisdictions implicated by the events.
105 CMR, § 170.248