Jin
Jin would sing his part in the song Lost as you sit down in a chair in the middle of the venue, you would be crying as everyone was just sitting and listening, and then clapping once he finished.
Suga
Suga wouldn't sing, but possibly rap slowly to one of your favorite songs he raps in as you two dance together slowly, and at the end you would share a kiss as everyone claps and wolf whistles.
Rap Monster
Rap Monster would defiantly attempt to sing at your wedding and he would most likely fail as his voice cracks and you cover your mouth while laughing and lightly hit his chest.
J-Hope
J-Hope would sing every single part of Butterfly knowing it was your favorite song. He would get on one knee like he did when he first proposed to you and kiss your hand as you smile lovingly.
Jimin
Jimin would sing Let Me Know because he wants you to let him know how much you love him. Throughout the little performance, you would make cute little hearts with your fingers and hands for him.
V
V would sing his song Stigma because he feels that it fits you most, and because you like that song. He would spin you around as he sang to you.
Jungkook
Jungkook would sing House of Cards because he loves that song just as much as he loves you. He would hold you in his arms as he sings for you and you fall in love with him once again.