A draft bylaw, unveiled earlier this month, aims to shield Tisbury’s housing stock from corporations like Pacaso and Ember, which market one-eighth ownership shares of vacation homes in popular destinations from Napa to Nantucket.

Something really big and different is about to happen at the Colonial Inn in Edgartown, but so far, the people who know what it is - the hotel's primary owner and a Tisbury real estate outfit involved in the deal - are keeping their lips locked.

They won't say a word until tomorrow and then again Thursday at cocktail parties in the Daniel Fisher House in downtown Edgartown. Party invitations read like a movie trailer voice-over script, enticing guests to the "grand unveiling," where they will "experience the ultimate," so "come see what it's all about."