Guests of Grapevine's Hotel Vin who arrive at 10 am Wednesday, June 21 will hear the first notes of a free concert from a local musician. Guests who arrive at 10 pm will hear the last notes.

Fort Worth songwriter-singer and guitar player Joshua Ingram will perform a 12-hour concert on the longest day of the year to raise money for the Alzheimer's Association. The marathon show, dubbed "ALZ the Songs," will take place continuously, 10 am-10 pm (with a few necessary breaks) at the Harvest Hall food hall.

It will be free for the public attend, but donations to the North Texas Chapter of the Alzheimer's Association will be accepted on site or online. Ingram says he hopes to raise $15,000.

"Playing for 12 hours straight wears on the body, and before it’s over I’ll have to superglue my fingers in order to keep playing,” Ingram says.

He's only half-joking. He knows the feeling because he's done it before. This is the third year in a row Ingram has taken on the 12-hour benefit concert, the second in its current format, he says. He estimates he's raised more than $15,000 in his first two years, but he and the North Texas nonprofit want to push the total even higher.

"We are aiming very high because Joshua and the Alzheimer's Association believe that Alzheimer's can be cured and the money raised goes to that purpose," he and the organizers say in a joint statement.

Ingram says the idea for the concert was born out of a challenge to see how many songs he could play from memory, without repeating any song. On average, says, he plays five shows a week and never uses music.

He approached the Alzheimer's Association with the idea for the fundraiser. They thought it was the perfect addition to their initiative called The Longest Day.

"The Longest Day is the day with the most light — the summer solstice. On June 21, people from across the world will fight the darkness of Alzheimer's through a fundraising activity of their choice," says the website.

ALZ the songs will take place outside of Harvest Hall at Hotel Vin (815 S. Main St., Grapevine). While it will be hot, organizers say, canopies will be put up for shade, kids can play in fountains, and attendees will be able to go inside for food, drinks, and cool air-conditioning.

For more information about the show or to watch a livestream, visit the official website.