I have to make 350 cupcakes and wanted frosting suggestions.

I am looking to make a frosting that is relatively quick to make and tastes light. 

Buttercream might be too heavy for my liking.

I will make the frosting one to three days before the event.

Do you suggest making the frosting 3 days before the event?

Some thoughts I have are italian buttercream or cream cheese frosting? 

Making icing 3 days before will depend on which recipe you choose.

I suggest my "2 of everything icing" you can find in the recipe section of this site. 

If b'cream is too heavy then you'll want to consider a non-dairy whipped cream such as Bettercreme OR Frostin Pride.

For a good Cr Ch b'cream go to Earlene Moore's site.  She has a great one that does not need refrigeration.