My friend who lost her daughter in March, well I was thinking about getting her one. I think it would be nice to look out the window and see "Megan's Tree". I just don't know when to give it to her. Megan's birthday would have been yesterday, but I hadn't ordered it. Maybe on the first anniversary of her death? I don't know, but I think it's a lovely idea.
As far as a service, I think it would be nice to create your own. Invite family and friends, the preacher if that's relevant.