No. Those don't exist. The questions are formed with DO or DID.

You CAN say these things. The meanings of some are a bit strange though. #1 It is very common to say "Do YOU happen to know what it is?" Using the first person seems odd though. It means something like "Can I by accident (or by coincidence) know what it is?" That sounds odd because you already know what you know, so why would you ask such a question? #2 This is OK, but you should use "could" instead of "can". Other ways to say the same: "Might I go there?" "Can I perhaps go there?" #3 This is OK but might not be the best way to say what you want to say. What are you trying to say? There are several possibilities: "Is it possible that I might meet the person?" "Might I run into the person?" "I want to meet the person. Can that be arranged?"