NOUN: A policy or a program that seeks to redress past discrimination through active measures to ensure equal opportunity, as in education and employment. The meaning is usually very specific these days, but it could mean more generally to take positive steps toward a solution of any problem.
INTRANSITIVE VERB: 1. To be or become mixed or united. 2. To join or take part with others: The faculty mingled with the trustees. In your sentence it means to socialize.