This spring will see two conferences in the midwest on the history of analytic philosophy.
First, there is Early Analytic Philosophy 7, hosted by Indiana-Purdue University, Fort Wayne during the weekend of March 15th. The keynote speaker is Michael Mi of Soochow University (Taiwan). The call for papers for this conference closes on Feb. 15th. See here for more details.
Later in the spring, Indiana University will host the Society for the Study of the History of Analytic Philosophy 2 conference. It is scheduled for the weekend of May 9th. The keynote speakers are Warren Goldfarb (Harvard), Joan Weiner (Indiana) and Peter Sullivan (Stirling). The call for papers for this conference closes on March 1st. See here for more details.