So many questions!! I'll do my best to answer them since I've been to Hollywood Bowl almost every year (I missed one year), and how the whole event is laid out. But number one, PLEASE DO NOT CONVO! Please PM each other.

1) Do we need a confirmation number to pick up our ticket?
It seems as if some people received confirmation numbers and some did not. All you really need is the person's name the ticket was bought under, and the phone number. It's also handy to have the last 4 digits of their credit card number that the tickets were charged under, and also know which section seats were bought. If you are really paranoid, you can call them and ask for a confirmation number. But honestly, when they look for your ticket, it's by your name, and they double check with your phone number.

2) Can we take the bus to and from Hollywood Bowl?
Hollywood Bowl offers a system called Park & Ride (go read SANBI's post). Rather than calling it a bus, you should call it more of a shuttle bus, since it doesn't stop at every bus stop. It picks you up at a specific location, takes you to the Hollywood Bowl, and brings you back. This is for people who want to save money on parking; however, there is a fee to take the "shuttle." Because the Korean Music Festival is during the off season of Hollywood Bowl, Korea Times has to rent out specific locations for the Park & Ride, so not all of them are available.

3) Can you we take a taxi after Hollywood Bowl?
Yes you can, but realize that you have to wait a LONG while after the traffic out there dies out. So many cars are trying to leave that area, that to find the taxi you ordered might take forever. I would suggest waiting it out or you can walk out to Hollywood and Highland area. There are always people walking around, but I wouldn't say it is exactly safe. Always have a number to a taxi company on your phone/wallet. There are also Korean taxi's which are cheaper. But taxi's are quite expensive in LA. There are many hotels near the Hollywood Bowl, so you can go in there and ask the concierge for a taxi company number.

4) What time should I get to Hollywood Bowl?
They do have preconcert festivities which not only includes freebies, but also mini concerts hosted by Radio Seoul. Last time, the group SERIOUSLY had a little performance. They sometimes have little dance performances, taekwondo demonstrations, or fan dances. You don't have to come that early (2 is early!!). Come around 3 or 4. It's also held OUTSIDE of the actual bowl. They don't open the entrance to the actual bowl until 30 minutes before show time. There is one main entrance that people try to squeeze in through, but there are actually THREE entrances into the bowl. There is another one in the middle (but if you go through this way, you won't get your glowsticks!), and there is a Pool Circle entrance on the backside of the bowl dome.

5) Do they give out Hollywood Bowl t-shirts?
They don't give out shirts. I believe the only year where they actually gave out shirts was in 2006 for World Cup. But other than that, people in the pool circle were given fleece jackets last year.

6) Can we sell our ticket if our favorite artist doesn't come?
It's your ticket, and you can do WHATEVER you want with it. Even if your favorite artist doesn't come, you might see your NEW favorite artist at the bowl! Korea Times does their best to pick only the best and top performers of Korea. And they also make sure to put on a top notch show that EVERYONE would enjoy. If they don't bring your favorite artist, don't sell your ticket! You should still go! There is nothing like going to a HUGE SOLD OUT outdoor Korean concert. I don't think I've ever heard anyone regret going to Hollywood Bowl. And who knows, maybe the artists that they bring will be a new favorite of yours once you see them LIVE!!!

IMPORTANT! Make sure to BRING FOOD! If you forgot to bring food, buying it at the Bowl is EXPENSIVE! You can go out to the main street and walk over to Subway and bring it back. It is a LOOOOOOOONG concert, so make sure to have food and water to keep you energized.Also, it is an OUTDOOR concert, and Hollywood Bowl is up in the mountain area, so make sure to bring a jacket just incase you get cold or winds start blowing.I hope this helped.