Have a Good Weekend

Happy Friday, everyone! Do you know “TGIF?” It stands for “Thank God It’s Friday.” You can say it at the end of the work week, when you’re happy that the weekend is near. Is there a similar expression in Japanese? What is it?
This weekend, I am going to Sapporo with Orin. We will go shopping, and meet Joe. We will probably go to karaoke! ^__^
What are your weekend plans?