@Yvonne592 The short answer is no you cant
the only solution I can see is to duplicate your listing. Block out Easter on your current listing, adn on your duplicate listing leave the calendar open for Easter with the price you want and the booking settings set up with no fees for extra guests. This will give your the flexibility to add other features over special events as the need arises. You can just block off dates in your alternate listing the rest of the time.
Other hosts may have other solutions, but I can't think of another way around it.
Regards