My email didn't say anything about first come first serve basis?
It only mentioned limited space available for players...
"Your registration request for the Bravo Poker 2019 TDA Summit IX has been received. TDA Summit IX is for TDs, CRMs, Poker Directors, and other tournament floor staff. Players may be admitted on a space-available basis"
In 2017, our name badges were laid out on a table, you put it on and went inside to take a seat. It wasn't full, there were empty seats.