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. That person will then be responsible for collecting agenda items either ahead of time, or at the beginning of the meeting he or she facilitates. Ideally, AG meetings should be discussion style. Allow the affinity group to evolve.