Agree with dragons reach....you all should know much better than that....anyone only spending a NAT holiday with the people who raised you into the man or woman you are today is pretty lame.
In all fairness, this is a pretty selfish mentality in regards to this argument. While you're not wrong, this is purposefully twisting an emotional argument in the direction you want it to go with the justification that you should care about a particular person (in this case, a mother) every day, and thus this "holiday" isn't special.
Unfortunately, that justification means nothing to the actual mother in question, because it's a day that through societal (and perhaps traditional) expectation a mother is potentially anticipating a bit of special attention. AND, that's not accounting for special circumstances outside of simply you, as an individual, spending time with the woman that birthed/raised you. In my situation, for instance, I have a wonderful wife who has mothered my two children, both of whom are of a young age, and it is my responsibility to her and to them to help my boys make something special for her. And that's just one example, because if one thing is true about modern society, many of us live considerably varied lifestyles.
That's not to say I'm not going to the Expo, and it's not to say that I'm not staying on Sunday and celebrating Mother's Day for my wife with my children on a different day. It's just an example that other people live life differently than you do, and it's not fair to makes the justifications you've made and assume they are applicable to everyone.