Guitarist & Vocalists for Wedding Gig

This is a nonreligious wedding ceremony with just the bride, groom and myself (the officiate). They want to do the ceremony on or near Signers Island Park near the Lincoln .Memorial next Saturday July 27th about 11AM outside. I am surprising them with a vocalist. I have listened to dozens both male and female and you are extraordinarily talented and I love the sound of your voice and vocal stylings. There is a Bob Marley song, "High Tide or Low Tide" that would be wonderful since it has deep meaning in their relationship. It's a ballad that would lend itself well to your style to interpret how you want of course. It would be an honor to have you there for about a half hour and perhaps 3 to 4 songs... at the beginning of the ceremony, the middle and the end. Would you be available and what would you charge? Thank you for considering being a part of this lovely young couple's special day.