I googled around for ultimate in Belgium a while back, before a trip,
and it looked at that time like you could find open practices in
Brussels and Leuven. Didn't end up playing when I was there though.
The one thing I did see, and I realize nobody is going to believe me on
this, was a kid, maybe 13, try to rip a throw that was essentially a
backhand anvert (travel though) over a crowd of old British tourists as
they were getting back on their bus outside the De Dolle brewery in
Esen--with predictable results.