Sad, but true. In our parish, the Rosary Society is the hospitality committee. It does NOT pray the Rosary! I refused to join.
Begin distributing handouts on the Rosary - copy them from the web. Do it weekly. Watch for incremental changes. The Rosary and a Latin/English Sunday Missal ( in the anticipation of a return to oldest of Roman Catholic traditions ) are two wonderful gifts the hospitality committee can buy, and distribute freely to interested parishioners of your parish.
Create the interest.
Shake off the stagnation of a passive-social parish in favor of an active faith-based parish. You have been blessed with a task. Go with it!