Acapella Christmas Carolers Needed

I'm looking for a group of 3-4 acapella carolers to perform at a work function in a private room at a restaurant. The carolers should be able to sing a mix of traditional and modern holiday songs in Melbourne, Australia.

Key Requirements:
- Group size: 3-4 or more singers
- Song repertoire: Traditional carols and modern holiday songs
- Performance within a month

Ideal skills and experience:
- Experience in vocal performance, especially in an acapella setting
- Ability to harmonize and perform a variety of musical styles
- Professionalism suitable for a work event

Please provide samples of previous performances if available.