Question

"the conference of psychologists at which the ideas of community psychology and the participant-conceptualizer role were first defined"

Answer 1

"The conference of psychologists, which took place at Swampscott, which the ideas of community psychology and the participant-conceptualizer role were first defined."

Answer 2

The correct answer is Swampscott.
The conference of psychologists which took place in Swampscott, Massachusetts, in 1965, was instrumental for the birth of community psychology and the participant-conceptualizer role. Community psychology deals with studying someone's psyche and mental abilities as part of a particular community and the society in general.