While wallowing on another website, I came across an announcement for "Tube night".
http://www.eham.net/ehamforum/smf/index.php/topic,96510.0.html"The 3938 tube net is held on the last Monday of each month at 8:00 pm Eastern time (3938 Mhz)."
Like a cover charge, there is a 3 tube minimum.
klc