Playing an OTB tournament tomorrow for the first time since 5th grade and I'm wondering about holes in my repetoire. This is what I know "well": Queen's Gambit, Slav (don't know exchange variation very well), Sicilian (Najdorf). What is the biggest hole in this repetoire?

Also, anything else that's very different about OTB that I should be ready for?

THANKS 

Could you be more specific about who is farting in my face or how I could prevent it? Thank you

You have a billion holes in your repertoire. Good thing is it doesn't matter.

Could you name a few of them? Much appreciated

Loooool.

ECO codes:

A00 - B89
C00 - D09
D13 - D14
D18 - E99

So basically 98% of chess openings.

The fat guy eating a burrito is usually harmless.

It's the anemic looking kid with irritable bowel syndrome you have to be careful of.

Throw out any book theory you know. It is your overall technique at this level is what will get you through. If you are unable to spot tactical chances or flaws in your opponent's position, then you probably won't get very far.

You should know how to win a pawn up in a K and pawn(s) endgame. And you should know forwards/backwards of how to play K+R+P vs K+R. 

Dude the only information you provided was what 2nd move you play against the main line of 1.d4 and the 5th move you play against the open sicilian. Nobody can tell you specifically what you need to learn, but given the way you phrased the question we can infer that

1.) there are hundreds of lines you're not prepared for 

and

2.) it doesn't matter.

It doesn't matter meaning I shouldn't be asking this question because I should be focusing on something else entirely? Sorry if I wasn't clear. I mean I know the systems that I mentioned fairly well, not just the second move . But maybe that doesn't clear it up either! I'm trying to ask what the biggest holes seem to be, or, say, the smelliest farts

Seems you favor  semi-closed (narjorf) and closed positions  ( Queens gambit)  so stay with those kind of positions and watch out for players trying to "open" things up with opening like the "smith-morra" gambit against the narjorf, just try and stay in your comfort zone no matter what opening they throw at you. GOOD -LUCK 

probably anti sicialians and perhaps setups with g3 against d4 (catalan like)

Will, everyone has holes in their repotoire. Just play your best, have fun, and don't sweat about the small stuff. It is, after all, just a game.

Good news is, the Slav is still just as asound as ever.

Najdorf is kinda good too. But has bit of a cloud over it, because of the English Attack. (Where white tries to play the Yugoslav attack, against the najdorf or Schevenigen.) Make sure you're ready for that.

(I recommend 6...Ng4. There are other choices.)

White also likes to play the Moscow a lot these days. 3.Bb3. Make sure you're ready for that.

The Bowlder is alsoe all the rage. 2.Bc4. Though I couldn't tell you why. You can pretty much just wing it.

You goddamn, no-good son of a.... Oh wait, wrong criticism.

You should concentrate on playing the game as a whole. Sure, you can study as many lines as you want, but what if your opponent doesn't know book and plays a move that isn't book nor part of your prep? What do you do then? This is where your tactical eye and technique come into play. An opening can only take you so far. You could "stand better" at a certain point, but if that is where the book ends, then how do you proceed? No position wins by itself. It still has to be played out. You should worry more about overall play than just the opening. If you were two pawns up, would you know how to convert it into a winning endgame - before your opponent checkmates your king because he has sacrificed two of his pawns to open up lines for his heavy pieces against your king? You should be prepared for that scenario rather than just the first few moves. Chess isn't just about the opening.

Please criticize me

You are a failure in life as you can't make something out of your living conditions

Don't be nervous about playing younger children. Even if they cry, just keep playing :)

don't worry about the holes you have, find theirs first. Just understand how to develop and kick their butt. Good luck.

At your level it is of crucial importance to memorize the mainlines of the Najdorf (at least till move 25!). That will significantly increase your chances in that tournament. 

Update for anyone who cares: I got crushed! Twice or maybe three times I made illegal moves, and I lost to extremely small children on several occasions. I got beat by, well, I don't even know what openings because I was too busy making illegal moves. And it was a blast! I highly recommend real life chess. Thanks for the help yall