Can I get respite care for my Dad for one night?

My Dad lives at home with my mother. I work away and come home on my days off. My mother is going to a family wedding in a couple of weeks. Would it be possible to put my Dad in respite care for one night. She's not his official carer but the public health nurse is involved with us and he has home help coming weekly? I don't know who to ask. Cheers.