Should I let my bf know that I know about the surprise shower/bday?

I know my surprise bday/baby shower is tomorrow. I have the urge to playfully mess with him tomorrow and pretend to refuse to go to where he l needs to take me lol. So mean. But if I admit I know he won't get to join in on the surprise. If I let him in on it, the urge to mess with him will be gone and he won't have to try and fib (which he's absolutely horrible at. He apparently wants to wake up at 9am tomorrow to "walk in the park" lol). Opinions?

Sorry, wrong group. Dunno how to move it

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