Biennial

Now, it is 1:28 AM and I am asleep (I guess you mean "awake"...? If you can write english in your sleep you are definitely very advanced!). So, I've decided to write something here, just to tire my brain, because writing in English is still hard for me, so I always get tired when I do it. A few minutes ago, I have bought* the tickets to the Biennial Book**, and I am going to spend all day there tomorrow***. The Biennial Book, as its name describes (or "implies"), is an event that occurs every two years here in São Paulo, and this is the biggest event of (or "in") the book industry of Brazil (or "the Brazilian book industry"). It takes almost two weeks and it ends this Sunday. Around 720 thousand people will go to visit**** the biennial this year, according to the news. I will be one of them. This is the 32nd edition of the***** Biennial, but it is going to be my first time there. As it ends in two days, I think that 100 thousand people will be there tomorrow, which means that even I can't (or "even I won't be able to...") find some books, I am going to have a big chance to make new friendships.
Now I will sleep, because my brain can not form even one more single sentence******. Bye

*="I have bought"puts the emphasis on the action being complete, rather than placing the action in time, so it's either "I have bought tickets to..." or "A few minutes ago I bought tickets to..."

**=This is a tricky thing to translate. I guess you are putting Biennial in front of "Book" because it's an adjective and most english adjectives go in front of their nouns, but this implies that you're going to a book and the book is biennial, which doesn't make any sense. I think you'd either have to say "The Biennial Book Fair" (or Expo or Conference or Event...) or else treat Biennial as a noun and keep it as "Book Biennial". I have never heard of Biennial being used as a noun, but they have written it this way on the english language version of their page http://www.bienaldolivrosp.com.br/en/ so either (a) they are making a mistake too or (b) this is further evidence that people who organise corporate events like to make up words and mistreat the english language shamelessly!

***=I hope you enjoy(ed) it!

****= "Must" implies no choice. "Will" is better, but might seem like you were more certain about the numbers than you really are, so you could say they "are expected to" instead. That is a common phrase in newspapers in this ind of situation. The words "go to" are OK but they are not needed with any of these three options, so a really natural way of writing the whole phrase would be "Around 720,000 people are expected to visit the biennial..."

*****="Edition" is normally only used for something that has been edited, like a newspaper, a book or a TV show. It is occasionally applied to other physical objects but not usually events.

******Aha! I knew you were awake!

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Very good. There are only a few mistakes and you are dealing with some fairly complex grammar, so you've done a cracking job! I'm sorry to be more strict than Perido. With all due respect to him, his comment at the end makes me think he's not a native speaker of English - even American English - so I think maybe that's why he missed some of these.

Biennial

Now, it is 1:28 AM and I am asleep. So, I've decided to write something here, just to tire my brain, because writting in English is still hard to me, so I always got (get) tired when I do it. Few minutes ago, I have bought the tickets to the Biennial Book, and I am going to spend all day there tomorrow. The Biennial Book, as it(s) name describe(s), is an event that occurs every two years here in São Paulo, and this is the biggest event of the book industry of Brazil. It takes(lasts would make more since) almost two weeks and it ends this Sunday. Around 720 thousand people must go to visit the biennial this year, according to the news. I will be one of them. This is the 32th edition of the Biennial, but it is going to be my first time there. As it ends in two days, I think that 100 thousand people will be there tomorrow, which means that even if I can't find some books, I am going to have a big chance to make new friendships.
Now I will sleep, because my brain can not form even one more single sentence. Bye

Good job with your English. For being tired, your English is great.
                                                                                                                  -Perido