'Four Days In May' happens every year in Dayton, Ohio. It is the annual convention of the QRP ARCI ham radio club and runs concurrently with the Dayton Hamvention.
It is an event for ham radio operators and, in particular, those interested in QRP, home construction, antennas and portable operating.
Check out http://www.qrparci.org/fdim for more information about FDIM 2014 FDIM 2014 dates:
Thursday 15 May 2014 - Sunday 18 May 2014