At The Tangled Arbor (200, 160, 2000) was this memorial to Canadian veterans, which had a service at 11 AM SL time by Tigerkitti Eberdene.
On one wall was a link to some music: http://www.youtube.com/watch?v=BcuRagfLXKQ
The Canadian Afghanistan Memorial Garden at Lichtenberg (80, 25, 45)
Patriot Island is more than just a memorial, it has an active military community, the US Military Veterans' Center, with regular events: Patriot Island (165, 125, 28)
The Virtual Vietnam Veterans Memorial at The Wall (39, 32, 25).
One can read more about "The Wall" at it's website: http://www.thewallsl.com/
At the London area, near the welcome area was this memorial area at Knightbridge (95, 230, 21)
Clicking on the fighter plane over the memorial led to this website: http://www.lastingtribute.co.uk/
By all means, these were not the only memorial areas. Just those I was able to find today.