Why is " tell me when will your ....held?" not "tell me when your autograph event will be held?"

This is not Interrogative sentence, isn't? Because there are "tell me" at the beginning of this sentence.

ah~I see. I am learning your language, and never knew that it sounds so rude for other when the sentence is not a Interrogative sentence until now. There seems to be no way to learn any language well by only reading texture books or by only what we were taught from schools. Too many subtle rules in languages are hard to notice for learners (for me, at least lol). To fucus on if this sentence is correct, on the other hand, didn't notice if this sentence is rude for other.

and ... I guess it sounds like urge or urge other "do your homework" or "get up" or "sit down", doesn't it?
(I've learned a rule in English that when there is no any subjects at the beginning of a sentence, and it sounds like telling something to a kid and ask to other to do something, "an order" ) It probably is your intention.

Damn, exactly! << How do you traslate this to Chinese? 沒錯，你超厲害的! or 完全沒錯就是這樣?
and oh! You should have told me earlier before I clicked into your page. lol
My country is using Tradictional Chinese, though, I can correct the sentences while reading your post if you would like me to do : )