A mimosa bar is the easiest hosting trick there is, because your guests make their own and you do nothing but chill bottles. The only two things that matter are temperature and pouring order.

Photo: Roberto Montoya / Pexels
The one thing that matters
A 1.5L bottle pours about sixteen mimosas, so buy one bottle for every six or seven people. Nobody has ever complained about too much prosecco.
About eight from a 750ml and sixteen from a 1.5L, at three ounces of wine per glass. For a brunch of eight, one 1.5L bottle is comfortable.
Roughly two ounces per glass, so a quart covers about sixteen mimosas. Buy one quart of juice per 1.5L bottle of wine and add a second flavour for variety.
Chill the bottles and juice overnight, and slice the fruit in the morning. Do not pre-mix. A mimosa poured in advance is flat by the time anybody drinks it.