Missions are the tip of the spear.
Mission trips are both the proof of your culture's response to Jesus, and the place where His invitations are renewed. Create a mission gathering to capture the prayers before, during, and after your trip, in the voices of the ones who send, the ones who go, and the ones who are blessed by what you bring them. When the trip is complete, roll your members into an ongoing prayer circle to keep the enthusiasm high, and then turn that group into the next mission gathering at a click.