Your friend also sounds like the type that wouldn't appreciate your chicken defecating during "her" ceremony. If you feed the silkie BOSS prior to the ceremony the poo will at least match one of the "official" wedding colors.
Honestly, this just sounds like a bad idea through and through.
Sure it can be done, probably with koolaid.
However, how is your chicken going to react to being outside its comfort zone and surrounded by a bunch of people and loud music?