THE PRETTIEST FANS: Michigan's hockey team has a big corps of solid fans but the prettiest ones are members of the Hockettes who perform for early comers before many home games. They are scheduled to make their final "hockey" appearance at 7:30 p.m. either Monday or Tuesday, prior to the Michigan-Denver contest here. Chicly uniformed and seriously happy in their performances, the Hockettes -- in their third year under guidance of Professor Richard J. Porter, of the U-M School of Public Health -- also make occasional pre-game appearances in East Lansing. Members of this year's group are Linda Lawrence, Michelle Murphy, Sue Brown, Aprill Krause, Carole Miller, Ann Wilson, Marilyn Gale, Sandra Kerr, Karen Young, Bonnie Wecker, Martha Woodruff, Carol Porter, Edithin Bateman, Penny Moore, Sally Dilno, Nancy Hanks, Liz Seligson, Marry Ann Colvin, Cheryl Miller, Robin Lawrence, Julia Daniel, Alice Leach, Sue Goldberg, Pat Poupare, Peggy Reed, and Marie Menefee.