I somewhat disagree with the fake part. Maria wanted her pals to dance with her. Sasaki, Makino and Inaba are "veterans" compared to the back row and have participated in lots of events together so they have better bonding, which ultimately made that moment.
The back row seemed forced because they are all newbies, which is why it was hilarious seeing Maho chickened out. Eventually, Morito chickened out as well.
While Nonaka was still awkward, it was still sweet seeing her attempting in keeping the mood going.