The Collaborative International Dictionary of English v.0.48:
Convener \Con*ven"er\, n. 1. One who convenes or meets with others. [Obs.] [1913 Webster] 2. One who calls an assembly together or convenes a meeting; hence, the chairman of a committee or other organized body. [Scot.] [1913 Webster] ConvenienceWordNet (r) 3.0 (2006):
convener n 1: the member of a group whose duty it is to convene meetings