All staff and contractors with req numbers are included. Contractors without req numbers need special permission from their bosses.
I believe that this task is as complete as it will get. We have 95% of engineers that I expect to attend registered. I have followed up with the managers (and engineers themselves) multiples times of the ones that are not.
We are regularly hiring new engineers as well - so I will over count my current count of 135 by 15 to be safe with catering and space. We can estimate that we there will be 150 people attending the summit. Does that work?