My sweetie and I have missed multiple momentous occasions due to circumstances beyond our control.

We've made the conscious decision to celebrate those occasions later, when things are better. Like "Hooray! Next week is Chriskwanzakah 2006! Hot diggity!" Even if we're celebrating in 2010.

Communication is everything. Missing a special calendar date is manageable if you talk about it. Even after the fact.

Maybe make your birth "day" next month the day for your celebration?