I think Quiet Riot Firearms is the founding father of that event
Yes, they regularly hold suppressor & MG shoots, here's a list of what they've done the past couple years.
MG Shoot at RHR - Nov 2014
Dead Air Demo Day at Charlie Elliot - Apr 2015
QRF Demo Day (Earth Day) at RHR - Apr 2015
MG Shoot at RHR - Nov 2015
SilencerCo/QRF Demo day in Griffin - Dec 2015
QRF Demo Day (May Day) at RHR - May 2016
MG Shoot in McDonough - Sept 2016
Suppressor Shoot in Macon - Oct 2016
I'm also aware of a suppressor shoot/metering day that is in the very early stages of planning that could be held here in GA in mid/late July. I'll post more info when I get it.