I've been thinking, gang, and here's what goes:
The name I thought of, to encompass EVERYTHING we know and love:
HensonFest
First, JHC, SW, and Diz all have to be willing to allow fans to do such a convention.
Second, it's just not worth doing unless performers and people from throughout Henson History make appearances.
Third, MONEY MONEY MONEY! Part of the funds comes from entry fees, another set of funds come from Sponsors. What are you funding? Space, guest rooms, guest travel expenses, guest food, advertising expenses, and mroe.
Fourth, someone has to convince sponsors to donate and get their names on programs, posters, etc; plus someone has to convince a hotel/community college to participate and donate space and rooms to guests.
Fifth, programming: Panel discussions are fine with the guest, but what else is of interest? Obviously we could show Henson-related movies, DVDs, etc (with permission of JHC, SW, and Diz), but would people be interested in puppet shows performed by attendees? Puppetry based discussions not related to The Muppets? Will either of the 3 companies, or all 3 companies, supply items for an exhibition of sorts?
Sixth, where? What's a good single location where everyone can come together that's inexpensive for travel and lodging? Obviously, I would want it in Memphis with a free day set aside for a trip down to Greenville, MS, to see the Jim Henson Museum down there; someone will want it in California next to the JHC and Diz; someone will want it in NYC next to Sesame Street's filming location; someone will want it in England, Australia, Japan, Switzerland, Mexico, and just about any other place.
There's soooo much to have to consider in all this that I doubt seriously anything would honestly be planned that could make everybody happy; much less the possibility of getting permission from all 3 companies to create an event like this. Time-wise and monetarily speaking it's too much work without the pre-produced funds necessary to get something like this off the ground.
However, there is another option:
1) Puppeteers of America hosts the PuppetFest each year.
2) Some other kind of Puppet Convention with a small emphasis to celebrate Jim Henson which MIGHT bring someone from Henson History down.
The second part of that I've been greatly considering, but first I would want to create a small puppetry organization (not unlike the Mid-South Cartoonists Association) to be host of the symposium. I also considered doing that second type of convention and offering Muley as host/emcee of the weekend.
I dunno--these are all things I keep considering over and over again in my head hoping something will pop (not physically, of course--that'd be bad for me to have something pop in my head). Whenever the GREAT BIG idea hits, you can bet I'll work toward bringing it to reality.
In the meantime, I'm barely keeping up on my Muley work, much less that of someone else's.
Also, I imagine whenever they want to do it the fine people at Diz, JHC, or SW will bring it together for us.