I did some digging:
Event 1, 2002: 63 novices (one class then), 170 entrants, 3 runs
Event 1, 2003: 24 novice stock, 25 non-stock, 177 entrants, 3 runs
Event 4, 2003: 30 novice stock, 24 non-stock, 193 entrants, 3 runs
Event 4, 2004: 39 novice stock, 23 non-stock, 181 entrants, 4 runs
Event 5, 2004: 38 novice stock, 33 non-stock, 185 entrants, 4 runs
Event 1, 2005: 27 novice stock, 37 non-stock, 194 entrants, 3 runs (this was the biggest event I could find in my records which go back to 2003)
I also can't figure out which event had the huge ST* open and novice combo which threw the entire event into a tailspin, but it appears to have been event 1 in 2003, based on Bob Lang's writeup here:
http://www.ner.org/sites/ner.org/files/solo2003_event1_writeup.pdf.