Really depends on the time of year for the location.
I have discussed this with some others (John H & Sam) a little.
John H is selling his coach, so he's probably out.
I suspect Bob W. will recommend the
HDT (5er) Rally at the Kansas State Fairgrounds in Hutchinson Kansas the middle of October.
Looks like that HDT bunch has a new web site
HERE - there is no cost revealed w/out (apparent) registration - and the REGISTRATION is not working <SMDH>.
As I recall the HDT rally was pricey IMO - some will argue that there is good value, I'm not so sure.
Personally we're committed to a Vintage Motorcycle Race in Birmingham (Oct 5 -7), and I'm still awaiting repairs from our blow-out in May.
As you can see from the HDT Rally picture the focus is on 5er's and pulling trucks.
The DynaQuest folks met at
Anchors Down RV Resort north east of Knoxville Tennessee not far off of
i40 near Dandridge Tennessee (where we had our blow out in May).