Argh, if only you could wait another 3 months or so. Just kidding. I just turned in my MVV application a week ago, so I have a bit of time to kill before my move to the Hague. 
Direct service from Brussels Midi to The Hague HS every hour; it also calls at Antwerp and Mechelen (I think). From The Hague HS you can either walk 15 minutes or take a tram (assuming you are meeting up at the Escher museum, next to the US embassy btw).
You guys have time travel?
I can’t make it on 29 september, helping some friends move to Cork that weekend
Hmm… I see that it seems that this project is not taking off properly at this time.
OK… I will leave this here and will see if I can organize it at a later date. Perhaps there will be more interest then!
All the best, and let’s hope to be able to organize something another time! Be assured that I am still interested in doing this, at some point in time.
Cheers!