This article is from the Toastmasters International FAQ, by Joel Furr DTM jfurr@danger.com with numerous contributions by others.
Usually no.
If you're visiting a community club, it might not be a bad
idea to let them know you're coming so they can tell you any
details like what time members arrive to eat and what time
members who don't come to eat arrive, but community clubs are
almost always open to all and they'll be delighted to have you
come to the meeting.
Clubs that meet at companies and organizations, on military
bases, or in prisons are often, but not always, restricted to
members or employees of the sponsoring body. These clubs are
happy to have guests but you sometimes need to call ahead to
get through security or to find out specifically where the
club meets.
Unlike some other organizations, where one must have a
sponsoring member who _invites_ you to the meeting and
introduces you to the group, Toastmasters welcomes all guests.
If the club is open to membership from the community, you will
usually be offered a membership application at the end of the
meeting.
 
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