There was a gathering in 1996, resulting in an ABC TV Special, written by Mike Nesmith called "Hey, Hey, It's the Monkees!" in 1997.
They played together as a foursome ("4kees") for the first time since the end of 1968, during "Thirty Three and a Third Revolutions Per Monkee". (Which should also be avoided at all costs)
Not very special. In fact, do not watch it if you can avoid it. Links here are provided for documentary purposes only.