Posting notices on the church door was common and appropriate.
It wouldn't be equivalent to, say, standing on a soap-box in the middle of a busy intersection and yelling at passers-by in the name of evangelism. Or the method of one missionary I know (a calvinistic and baptistic man) who would "trap" people by sitting in the aisle of the metro bus and "evangelize" the passengers during their ride (he spoke...actually seemed to brag of intentionally "cornering" or "trapping" people so that he could preach to them and was taken aback that I would question his methods...obviously I didn't believe in evangelism...).