Today I had a job interview and was hired. My schedule has not been made yet, but I have plants on Halloween?

not sure if it helps, but it really depends on what job it is
if you tell the HR ASAP you've made prior commitment that day, it should be fine. and if they must schedule you for that day, somehow i feel it would be better you just sacrifice your party this year because afterall, you're new.

hope it helps

First of all, Halloween is not a holiday, as in legal that is. You must be very immature if you would sacrifice a new job for a party. Grow up and start acting like an adult.

death in the family - (your goldfish or ur plant who cares they wont check)