The DA/UA host one event during the middle of the week for EU players. And the majority of people in it are not affiliated with either army. (Reznov's event).
The DA/UA do have a PRIVATE event that they host for going against one another directly, however I fail to see how the EU part of the community can complain, after all its NOT open to the public.
Would the DA like other non DA/UA events, HELL YES. I believe the majority of regiments in Braggs Brigade (NA based majority) attend an event hosted by Forlorn Hope Eatjello on Thursdays. An event on Sunday hosted by 2nd MD/ItaliaGuards.
26th NC (in Braggs Brigade) also HOST an event on Tuesday, and one of their PFC's hosts another one on Sunday. Both events are NOT UA/DA only and infact 60-70% of the participants are NOT UA/DA.
For EU, sadly we only have the event hosted by Reznov on Wednesdays that is NOT UA/DA only. This is due to the lack of non-affiliated regiments on the EU side. Probably because the EU regiments came together and made the UA/DA.
But I still do not see what the problem is with having a private event for the two armies is?