These lovely stars are part of a series that the creator posted to YouTube, showing you how to make loads of clever and quick Christmas-themed shapes. She has posted one a day throughout the Advent period to make a Crochet-Video-Advent-Calender, but I could easily see these makes hung on a decorated background for an actual Advent Calender. The whole video is only 4.20 minutes long.
Where the pattern asks for an sc, crochet UK DC. where it asks for an hdc, crochet a UK HTR, where it asks for a dc, crochet a UK TR.