My H took his ring off a week before he moved out and hasn't worn it since. At first, I too, was very upset and angry with this. To me your wedding ring is a symbol of your marriage and should be worn until the divorce papers are signed. Then I slowly came to the realization that whether my H wears his ring or not is out of my control.
Focus on things that you can control, like taking your kiddos to the concert and enjoy your time with them.
So what if you H is an A$$. Forget about him for the momment and focus on you.
Me & H: 33 yrs S: 4 & 6 D: 2 M: 9 yrs ILYBNILWY: 8/09 SEPARATED: 9/09 The Beginning