Seek out people who care. People cannot be expected to act if they don't know the facts. An affinity group's first step should not be Civil Disobedience. Be in an affinity group with people you like and trust. Be creative and decide on actions as a group.
Consistency is most important.
Regularity allows people to arrange schedules. Actions like weekly vigils help spread word, create trust between AG members. Meetings are also important. People need to connect outside of pressure situations. Outside facilitators are usually not a good idea for an AG because of the key trust factor.