What is a calling reception?

A calling reception is a reception where you drop in during a certain time period and "pay a call" on the bride and groom or person being honored. This differs from the usual reception where dinner is served at a specific hour and everyone arrives at the same time.

In this way a calling reception is similar to an open house. Typically guests arrive at any time in the announced time period, greet the bride and groom in the reception line, enjoy some refreshments, and leave a gift.