Next week is the start of Valve's big winter sale. There will be a winter sale with thousands of titles discounted between December 22nd and January 5th.
Good deals are also usually present. The Master Chief Collection and Control Ultimate Edition have both been discounted in the past. Valve is teasing deals on many items this year. You will probably forget to play when you buy things.
The Luna New Year sale is going to be replaced by an annual spring sale. There will be a sale between March 16th and March 23rd. Valve said that it was a popular request from the developer and publisher community.
This upcoming spring sale means there is now a major steam sale for each season, with the autumn sale that ran at the end of November, next week's winter sale, and the regular summer sale. On December 22nd, there will be a winter sale on the store.