Pre-Registration for Main Event Posted on December 15, 2014May 4, 2015 by OGPC Admin FREE Pre-Registration for OGPC Main Event. Please pre-register your teams now, so we have a better idea how many teams will be attending in April. Select 1 ticket for each team you are registering at this time. We understand that not all teams will be able to attend the main event. Pre-Registration Link *BONUS! *When you pre-register for OGPC, your teams get a free Treehouse account. Treehouse has over 100 courses and hundreds of hours of video to help your teams develop their projects. Your treehouse account link will be sent with your ticket confirmation. Notice: You will still be required to complete a full registration in March, and submit $50 for each team that will be attending the Main Event. Don’t worry, we will send you a reminder when paid registrations begin.