Several wedding events are planned soon after 12:01 AM on Monday in Hawaii as a gay marriage law takes effect.

Three of the couples who first legalized their relationships in civil unions in 2012 will be among the six same-sex couples marrying at a midnight ceremony at the Sheraton Waikiki hotel. It is one of several midnight wedding ceremonies planned to inaugurate the law.

Hawaii Health Department spokeswoman Janice Okubo told the AP that gay and lesbian couples can begin the application process online at 12:01 AM.

Legalizing such unions is estimated to add a $217 million tourism boost over the next three years to the Hawaii economy.

“I think, overall, marriage and weddings is a key part of what we do in Hawaii,” said Kelly Sanders, area managing director for Starwood Hotels and Resorts, which owns four Waikiki properties, including the Sheraton. “When you look at the GLBT market, the biggest thing is they need to know they're welcome. Hawaii is an all-inclusive destination.”