Some of the comic market seiyuu events that I know of..

2002.12.28 [15:00] Comic Market 63 main stage Mix Juice Stage
  Nakahara Mai
  Ueda Kana
  Saitou Chiwa
  Morinaga Rika

2002.12.28 Comic Market 63 KSS Booth
  Asano Ruri
  Shima Ryouka

2002.12.28 [13:00] Comic Market 63 KSS Booth
  Nakahara Mai
  Ueda Kana
  Saitou Chiwa
  Morinaga Rika

2002.12.29 [12:00] Comic Market 63 main stage
  Yamamoto Maria

2002.12.29 Comic Market 63 Two Five Booth
  Mochizuki Hisayo

2002.12.30 [12:00] Comic Market 63 main stage
  Yamamoto Maria

2002.12.30 [14:00] Comic Market 63 main stage G-On Riders Live
  Makiguchi Yoko
  Kanzaki Mayumi
  Momose Machiko

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Hitoshi Doi                                               Toshi Nibunnoichi
http://www.win.ne.jp/~doi/                                    doi@win.ne.jp