People have been asking me about how to buy Burning Man tickets, and as the RD of the Burning Man Ultramarathon, I've answered this question many times. Here's what I hope is a slightly-easier-to-understand explanation.
Directed Group Sales
Are you a core part of a critical theme camp or some other important project on playa? If so, you received an email to invite you to be a part of these from your group leader (camp or project). You'll know if you are a part of this. After you created your Burner Profile, you will be able to buy tickets at noon PST on the 12th of February.
General Ticket Sales
First, create a Burner Profile.
Next, between February 20 and February 23, you have to REGISTER to buy tickets. Not buy, but register to enter the sale.
Then, on February 26, starting at noon PST, you can then buy tickets - if you did everything.
Read the full ticket information very, very slowly. And then hold your breath. Let it go because you may have to wait. You may wait in virtual line for over three hours. It is a little overwhelming, but once you get the ticket, it's only seven or so more months of waiting. Woohooo!
Note, everyone needs tickets - even if you are just running the ultra. Even I buy tickets as the Race Director.