Anime Events - Getting Tickets?

Hello,
There is going to be an event for one of my favorite anime series happening in Japan while I am there. It's the sort of official event where they make presentations and announce new things, not a doujin fair. I have heard that it is hard to get tickets for these sorts of things, so what should I be doing to prepare? They haven't announced a date when tickets go on sale, and I have no idea what to expect.
The event is November 27th (It's the Code Geass 10th anniversary event).
- How much are tickets to these things, usually?
- Is it one of those things where you have to sit there refreshing the page in order to get tickets, or do they take a few days to sell out? (It's at Maihama Amphitheater, if that helps)
- If I'm outside of Japan, will I need someone inside Japan to get my ticket for me? Where would you recommend looking for someone like that?
- Is themed dressing - not cosplay, but like, wearing the SuperGroupies items released for the series - good or frowned upon?

Any other relevant information would also be helpful. Thank you~

A1
That event hall has about 2200 seats like this.
http://www.maihama-amphitheater.jp/organizers/index.html
http://www.maihama-amphitheater.jp/organizers/seat.html
Maybe all seats are so but feels enough numbers seat.

A2
No sales at event hall ticket window usual as big/special official anime event.
Event hall company is no related so they don't know about event tickets NO HELP.

Follow the official twitter if yet.
https://twitter.com/GEASSPROJECT

A3
Depends on ticket sales rules. (too,early)
If not will be so, Make/Find a friend ASAP
who really like anime also understanding Japanesse pretty well.

A4
I don't think so also good cosplayer are all welcome and 'd like to "selfie" together :)
Fan appeal is one of important will make you also around fun,right?
(No pizza bringing with)
http://larg-san.deviantart.com/art/C-C-Code-Geass-and-Pizza-Hot-108568...

Basically, so far only the date and location have been announced. Everything else will be announced later.

http://geass.jp/lelouch_10th/event/event01.php

I'm already following the twitter. I'm just wondering what to expect, from people who have been to these sorts of things before.

Okay so it looks like they released information, and it's by lottery, and I have until the 13th to enter. Trying to create an account now...