Aloysius would have been amused and pleased throughout the whole thing. He has just enough French to be able to more or less follow what's going going on in the ceremony and he's not surprised that it's short and sweet.
He would have laughed when Pepper and Jo disappeared and probably made a few slyly amused comments to the others and definitely to Pepper and Jo when they got back. He would have danced very, very badly but enjoyed himself anyway, probably mostly by laughing at himself. (He can do the formal dances quite well because they have instructions but freeform dancing... yeah, he kind of looks like a chicken on acid.