Summoner (Wicca) Wikipedia
The Summoner, sometimes called a Fetch is a position in many traditional Wiccan covens. The primary, or at least most evident, function of the Summoner is to call other coven members to a meeting or ritual. The summoner is also responsible for all inter-coven communication and traditionally is the only member of a coven who will know where other covens reside. (This tradition is generally not followed today and there is argument about to what extent it was ever followed.) In many covens the Summoner is always male and is considered the masculine equivalent of the maiden.
Historically it was the person who would let members know about covens and find new members in the community.