Ariving to Munich
We arrived to Munich at 10:30am. We purchased 18 euro day pass for all transportation. After checking and relaxing for a while in our hotel we went to Oktoberfest. We didn't have any reservation but we made it before 4pm.
Why is so important to be there before 4pm? That is what I wanted to know. The answer is that all the reservations are made for 4:30 pm and if you are at the table which is reserved you will be asked to leave at 4 so they can set up the table. Of course everyone who is already in the tent is going to look for unreserved seats. So in order for you to get the seat you need to show up well before 4 so you can look for the seat when they are still available. This only applies for weekdays. Weekend is completely different story. You need to be there at the opening. That is my experience after visiting Theresienwiese 4 times during our stay in Munich.