Thanks to everyone for providing much of the information already!
As to 2013:
I scheduled 60 events and expected 402 players. We ended up running 117 events and had 621 players.
To compare one year further back, 2012 had 53 events and had 292 players.
I made a conservative increase in number of events for 2014, not sure if the huge turnout in 2013 would repeat. With the increase to 7 tickets per table and 25% more events, it was very conservative. However, Floating GMs and awesome volunteers made the difference!
I set a hard cap of 7 per table because 8 sometimes gets unwieldy, but as mentioned, we often had 2-3 players left over after filling pick up tables and asked tables for permission to add an 8th player. I want to thank those tables that agreed as it helped us keep our promise to turn no one away.
Unfortunately, there were some instances where players would show up quite late and we had to ask them to come back or play at the Quick Play area.
Due to the amazing fan response, I will once again increase the number of events at Origins 2015, still with the tickets set at 7 per table. I will have Floating GMs available if the turnout proves greater than the increase can handle.