Intern at midcap, need an excuse for an MBB process

Hi everybody, Its been a long time since i'm scrolling and laughing on the forum, but now I face a situation: I was in PE as an intern & refused a full time, I wanted to see other things. At this time, I sent a submition for a full time at an MBB, And this MBB invited me for rounds, the thing is, I started an other internship in a great m&a boutique. I now need a day to pass those rounds, the thing is, I need an excuse for not being in the office during a whole day without compromising me. Got some ideas, but they aren't so bright, so if you are quiet creative, I will help you find a table at Dorsia.

PS: I know m&a & mbb are quiet different, but you know seeing the bubble coming....

Sincerly