For the really keen MOTU fans, a convention is on in Los Angeles on the weekend of September 9th & 10th, with three guests already announced (including Garry Chalk from Transformers, for a number of MOTU voices he did in the New Adventures and the 2000s cartoon).
The other two guests so far are voice actor Michael Donovan, and actress Meg Foster (Evil Lynn from the live action MOTU movie).

Attendee, non-attendee, and exhibitor registration for Power-Con 2017 will open on Saturday, April 8th at 9:00 AM Pacific / 12:00 noon Eastern here on the Power-Con website.

  • Saturday, September 9th Only: $25
  • Sunday, September 10th Only: $25
  • Weekend, Both Sep 9th & 10th: $40
  • POWER PASS* Weekend, Both Sep 9th & 10th: $150

The Power-Con Masters of the Universe Classics exclusive 3-packs will be available at $105 US each for Attendees and Exhibitors. Attendees and exhibitors must be present at the convention to pick up their exclusives; they will not be shipped.
(I only came across this thanks to Ultra Marginal's MOTU music CD topic, doing a search on it... so I don't know if this is the first MOTU convention by these people, or if there have been others.)