Run an organized meeting. Try to conclude meetings as close to the published time as possible, especially for young adults. Adults need to count on getting out of a meeting by a certain time so they can be well-rested for work, get home to families, etc. Theory - People drive up the FotoMat, drop off their film, and pick it up two days later. The majority of people should simply come to the meeting, socialize, enjoy that night's topic or discussion, socialize a little more at the end of the night, put a few chairs away, and then leave.
Consistency is good marketing.
You can imbed your meeting in the lives of people by having the same type of meeting on the same day or date. Work hard to make sure every new person is welcomed. This can't be. Leaders need to read books and listen to tapes and then use these as resources. Matthew Pinto is the Managing Editor of Envoy Magazine, a new journal of Catholic apologetics and evangelization.