You are not a bad mom because you are trying to better yourself. Take them to the celebration either the night of fireworks, after 6 or Sunday morning while most are at church. The night scene usually is more relaxed. Take the girls to the movies, bowling, arcade (aka. chuckie cheese), fast food play area or a park. You could always do a movie marathon if all else fails. The point is to take them somewhere that you do not have to engage with them, or others but they are having so much fun they don't realize. Bring laptop or music so you don't realize your around people.