For anyone curious or interested, these are some Guest & Event stats of BotCon since it started in 1994.
(full listing can be found here)

Most frequent guests...
11
Simon Furman - 97, 98, 99e, 01, 02, 02e, 03, 04o, 06, 08, 12

8
Peter Cullen - 97, 04b, 06, 07, 09, 10, 11, 12
David Kaye - 97, 98, 03, 07, 08, 09, 11, 12

6
Vince DiCola - 97, 00, 01, 03, 04o, 09
Scott McNeil - 98, 99, 01, 04o, 06, 10

5
Stan Bush - 97, 07, 09, 10, 11
Michael McConnohie - 02, 04o, 04b, 09, 11

4
Gregg Berger - 01, 03, 09, 11
Garry Chalk - 98, 01, 03, 12
Pat Lee - 02, 03?, 04o?, 04b
Jim Sorenson - 08, 09, 10, 12
Derrick Wyatt - 08, 09, 11, 12

3
Wally Burr - 04b, 05, 13
Paul Davids - 01, 04b, 09
Flint Dille - 04b, 09, 11
Bob Forward - 97, 98, 02
Dan Gilverzan - 04o, 04b, 12
Marty Isenberg - 08, 09, 11
Bryce Malek - 98, 04b, 09
Robert Orci - 07, 09, 11?
Andrew Wildman - 97, 98, 04o
David Wise - 98, 04b, 09


Most frequent Voice Actors...
8 - (G1) Peter Cullen - 97, 04b, 06, 07, 09, 10, 11, 12
8 - (BW+) David Kaye - 97, 98, 03, 07, 08, 09, 11, 12
6 - (BW) Scott McNeil - 98, 99, 01, 04o, 06, 10
5 - (G1) Michael McConnohie - 02, 04o, 04b, 09, 11
4 - (G1) Gregg Berger - 01, 03, 09, 11
4 - (BW+) Garry Chalk - 98, 01, 03, 12
3 - (G1) Dan Gilverzan - 04o, 04b, 12
2 - (G1) Abby Collins - 11, 12
2 - (G1) Paul Eiding - 10, 11
2 - (BW) Venus Terzo - 97, 00

Autobots (Movie Vehicles)...
3 - Optimus - 07, 09, 11
2 - Ironhide - 09, 11
2 - Ratchet - 09, 11
1 - Bumblebee - 11
1 - Sideswipe - 11

Main Events...
Concert - 97, 00, 01, 07, 09
Formal Dinner - 02, 04o?, 04b, 06?, 07?, 10
cartoon or movie preview - 97, 99, 02, 07, 08, 09, 11
computer game preview - 97, 07, 09, 10, 11, 12*
script reading - 98, 03, 04o, 04b, 08, 11*, 12
Pre-Con Tours - 05, 06?, 07*, 08*, 09*, 10*, 11*, 12*, 13*
Custom class - 06, 07, 08, 09, 10, 11, 12, 13
Casino night - 05, 08, 11, 12, 13
Hasbro tour - 07
Paramount tour - 09
IDW tour - 13
Hall of Fame - 10, 11, 12, 13?
film fest - 05?, 06?, 07?, 08?, 09?, 10?, 11, 12, 13
Golden Ticket - 12, 13