A gay marriage law approved last month takes effect in Hawaii on Monday.

Several gay and lesbian couples are preparing to marry soon after 12:01 AM.

A midnight ceremony at the Sheraton Waikiki hotel will include three of the couples who first legalized their relationships in civil unions in 2012. They will be joined by three additional couples.

Gay couples do not have to wait until the Hawaii Health Department opens its doors at 8 AM, they can begin the application process online at 12:01 AM.

According to one estimate, the law will provide the Hawaii economy with a $217 million boost over the next three years.

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