Last year, the march and opposing activities took place last year in defiance of the ban, with a heavy police presence. The 2009 ban was supported by a lower court (the same institution that lifted the ban this year) but was overturned almost a year later by an appeals court. Apparently that decision, balanced against evidence that possible disorders could take place, was the reason that the lower court lifted the ban this year.
In all likelihood, the march and counterdemonstration will take place (this blogger is in Stockholm for much of the day and won't be able to make a direct report) with police keeping both sides apart.
Supports of the Latvian Waffen-SS legionnaires (most living veterans are in their late 80s) maintain that the soldiers drafted by the Germans were not ideologically Nazis and fought to prevent a return of the Soviet occupation that saw 15 000 Latvian citizens deported to Siberia on June 13-14, 1941/
The ant-fascists argue that fighting on the side of Nazi Germany for whatever reasons should not be "glorified" by public commemorations. They point to a certain overlap of the manning of the Latvian Legion (largely drafted) with members of the Latvian Police Battalions, which were formed earlier and participated in actions against partisans and civilians in Belarus and Russia.