If you want
every member to show at a meeting; all you have to do is announce that a fraternity will be serenading.
At UCSD
all the chapters serenade to introduce new pledges to the Greek system. Everyone has a blast and the actives always fight over who gets to accompany the pledges. The serenading chapter brings some cookies or candy. The fraternities also bring roses for sorority presidents and girlfriends.
The style of serenade done here, I think, is different than other schools. For the most part; serenades here involve dance routines as well as singing. Think *NSYNC and Brittney Spears routines. Not routines just inspired by them; but the
actual routines.

Needless to says there's weeks of practice before the dances are revealed. We then usually incorporate them into Greek Week and Derby Days.
The only exceptions I know of to this is when all the Sigma Chi actives serenade. Thier pledges do a seperate serenade. Also one of the sorority chapters does a "serious serenade". They wear black dresses, heels, and pearls. Then they light candles and sing love songs or something. :shrug: