20.1. Arrangements for the Holiday Package are made many months in advance by the Company. The Company expressly reserves the right to change the arrangements for the Holiday before or during same, should such changes become necessary or advisable for operational, commercial or safety reasons. Changes to the vessel’s itinerary, including but not limited to, changes to or omissions of one or more ports or areas on the vessel’s itinerary, changes to the date and/or time of the itinerary, and/or changes to the route of travel or destination, and/or any change or cancellation of theme services, amenities, additional entertainment, special events, ancillary items and/or supplementary services, may occur from time to time for a variety of reasons including but not limited to weather or seas conditions, rescue of others at sea, medical emergencies requiring diversion, medical quarantine ashore, the instructions of port or governmental authorities and any Unavoidable and/or Extraordinary Circumstances. These changes must not be considered Booking changes giving applicability to clause 20.2 below.
20.2. MSC will notify the Passenger as soon as reasonably possible of any changes to their Holiday Package, which change amounts to a significant alteration to an essential term of the Contract.
20.2.1. Where the change is effected before the start of the Holiday Package:
20.2.1.1. The notification of alteration will specify a reasonable response period by which the Passenger must notify the Company of their decision. The notification will further specify that if the Passenger fails to respond within the imparted time, the alterations will be considered to be accepted.
20.2.1.2. In such circumstances, MSC will allow the Passenger to:
20.2.1.2.1. accept the change; or
20.2.1.2.2. In same cruise season - change the date of the Cruise to another offered by MSC, subject to the conditions of clauses  17.3.2, 17.3.4, and 17.4.
20.2.2. If the Booking change is made during the performance of the Holiday Package and a significant proportion of the travel services cannot be provided as per the Cruise Ticket, the Company will provide suitable alternative arrangements, of similar quality or commensurate value, for the continuation of the Holiday Package, or arrangements for another Cruise at a later date subject to clauses 17.3.4 and 17.4 or – failing to do so – the Passenger shall be reimbursed of the price difference in the event that the alternative arrangements are of lower quality/value than those specified in the Cruise Ticket.
20.3. See further clause 12.2 regarding changes to cabin assignments.