EDIT: On Tap is closed Monday, Tuesday, and Wednesday. I can’t see info one way or the other about the Brass Monkey. I believe I saw signs at Redpoint last week saying they were closed for at least one of the CNY days.
Here are the hours for the Tianmu Sogo, with the restaurant floors being open both evenings: to me that suggests you’d be fine at most department store restaurants. Although Dingtaifeng is closed.
And have a look in this thread - people were posting in it a couple of years ago. More links inside it. (Mods, maybe even merge.)