tupperware party

from The Collaborative International Dictionary of English v.0.48

Tupperware party \Tupperware party\ n.
   a social gathering at which the host (or more typically
   hostess) entertains the guests, and provides them with an
   opportunity to order Tupperware. This was used as an
   effective sales strategy by the Tupperware manufacturer, and
   provided income to the host(ess) from commissions on sales.
   [PJC]