My niece wants me too go to her baby's 1st Bday party but hasn't told me were it will be. I don't want to go since I'm working that night.-

Should I ring ahead and tell her I'm not going or just ignore it, since she still hasn't told me were it will be...
I tried to get time off work to go when I though it would be at her house a 6 hour drive away. Now all of a sudden she'll be somewhere in the city. Its probably a good thing I couldn't get the time off...