Final answer:
A conventional crowd is a collection of individuals who gather for a regularly scheduled event like a religious service, distinct from other types of crowds such as casual, expressive, or acting crowds.
Step-by-step explanation:
A conventional crowd is a term used in social studies to describe a group of people who come together for a regularly scheduled event that occurs regularly. This type of crowd is one of the four types identified by Turner and Killian (1993), typified by events such as religious services, where individuals are usually present for a specific purpose and expected to follow particular norms and behaviors. It differs from casual crowds, expressive crowds, and acting crowds, which may not have the regularity or scheduled nature of conventional crowds.