Many fine establishments have party rooms available, but be sure to ask about menu options and gratuity policies, as they very from place to place. Caroling parties are an old-fashioned but still fun way to get people together. If you are in a church or community singing group, chances are you are already giving concerts, perhaps at a nursing home or veterans hospital. Maybe you and your fellow songbirds know some people who are home-bound for the holidays and need some cheering up. Depending on the size of your group, it probably wouldn't take long to come up with a whole list of caroling destinations.
Fresh flowers are an unexpected luxury in the dead of winter.
Buy an extra bouquet to split into smaller bud vases. It's easy to overlook some important things when getting ready for company. I like it when people leave a candle burning in the bathroom, instead of a bright light. Nice for ambience, but somewhat of a fire hazard. I like putting colored light bulbs in the fixtures instead.