I have heard of open house, but this tops the lot.
Joshua and Kimberly Colton of Amesbury, Massachusetts, organised a number of speakers in the summer of 2002 to speak on various gospel topics in their home. They provided an open invitation to the public through newspaper and television ads.
Their website does not say how successful it is, but the local paper?¢‚Ç¨‚ÄùMerrimack River Current?¢‚Ç¨‚Äùspecifies that they are holding the lectures every Thursday.
When I was a ward mission leader?¢‚Ç¨‚Äùand when I later served in the stake mission presidency?¢‚Ç¨‚ÄùI helped convince the stake mission president and the stake president that we needed to hold an open house. The first year saw over 100 people attend in three meetinghouses. Every year since then, it has been dramatically more successful.