Depends on number of days
1. Apogee Grands, Netherlands. I haven't heard the ones with NATs yet, but these speakers IMO beat anything at Munich, or anywhere, by a fair margin
2. WE 16A, Leipzig - he is getting another WE Londons.
3. Trios with bass horns in Frankfurt or Monaco though I am sure US folks could find some in their area
I am sure you guys could do the Wilsons, Vivids and Magicos anywhere, US or other places, so need to go to Munich for that. You could if you wanted listen to the Neoliths and Cessaro Liszt in London but again US guys could do that in the US. Stenheim is at audioarts in NY, and in EU in Switzerland, plus Hyperion is getting them in Stockholm. There will be Kaiser and Kondo distros in the US as well.
Tune Audio Animas are in Paris and Birmingham. Pick one.
There are Acapella distros in the US.
There is a DIY horn in Berlin. Some of these speakers listed above may not be buyable or implementable, but they are all very different sounds from each other and help us discover what is important to us, and IMO do so better than Munich. Munich is then good to visit to enjoy with fellow gearheads, and look for a few things to add onto potential audition list, but like with any hifi show I would strongly suggest against using it for critical listening and judgements on gear save a couple of exceptions.
What I do miss out from EU tour, which a lot of people want to listen to is the Vox.
"There will be Kaiser and Kondo distros in the US as well."
Rhapsody (Rhapsody.audio) is the US distributor for Kondo and Kaiser, located in Manhattan.