W.W.
ETA: My mom lived on the other side of the country and is now dead. My MIL is dead and lived in Boston. We NEVER did anything for Mother's day with them. We sent flowers.
Up until 8 years ago, we went into DC and walked around the Mall - they had a "public service celebration" and all of the US military branches would set up things on the Mall and show people and kids how to operate things, see the Air Force 1 helicopter and much more.... it was great to see my boys light up with awe!
Now? We go out for brunch and we "chill" at home.