You can find kitchen knife while doing The Rookie Guard Quest, exactly last mission where you can go inside Rookgaard's "Orc Fortess" and it's in the kitchen - exactly here
As you can see on the screenshot, kitchen knife is on the table
Requ answered your question about the knife, but I can add that you can buy a party cake at Norma's for 50gp.
You can't make a party cake yourself, because there are no candles on Rookgaard, you can only make a cake (decorated).
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