Mob s fans are the youngThe Mob, a seven-man group with roots in Chicago, comes on like gang-busters with a repertoire that is decidedly frenetic. From Joe Tex to the Bee Gees’ “Nights on Broadway,” the music is loud and brassy — no Barry Manilow softies or barbershop medleys with this bunch currently performing at the Navarone Restaurant in Elk Grove Village.But if The Mob’s musical style disappoints soft rock fans, it is just what the largely teen-age and young-twenties crowd enjoys. Jammed three or four deep at the bar on a recent Friday night, the young audience obviously appreciated the large number of disco-tvpe selections, which gave them a chance to strut their stuff on the dance floor.Night outDIRECTING The Mob’s Blood, Sweat and Tears sound is “Big Al” Huerrara, the lead singer and sax-handier. Another standout is trombonist and guitarist Michael Sistak, who joins Jimmy Soul in a “Dueling Banjos” type of arrangement on Sistak's original song, “Gemini Lady.”Rounding out The Mob is Gary Biel-bier on keyboards and sax, drummer Joe Farroh, bass-player Eric Collins, and Jim Ryan on the keyboards and moog synthesizer.Flashing red lights and gangster suits notwithstanding, The Mob provides an enjoyable couple of hours if you enjoy that kind of brassy style.But if you're looking for variety, better luck next time.The Mob will be appearing at the Navarone through the first week inJulyi»iilS^;tu-; *—Laura SchmalbachLizaMinnelliLIZA MINNELLI and Barry Nelson will appear together at the ShubertTheatre beginning Monday in the new musical “Shine It On.”The play about a young performer who must reconcile her drive for fame with her personal life will be in Chicago only through July 16.George Furth, author of “Company,” wrote “Shine It On” especially for Minnelli. John Kander and Fred Ebb, who also did the score for “Cabaret,” wrote the lyrics and mis-ic. Director is Martin Scorsese.Shirley Knight stars in the worldpremiere of John Guare’s “The Landscape of the Body” opening Thursday and playing through July 24 at Academy Festival Theatre, Barat College, in Lake Forest.THE PLAY IS presented in cooperation with Joseph Papp’s New York Festival and will open at the Public Theatre in New York this fall. Directing the production is John Pasquin who staged the off-Broadway production of “Moonchildren.”Knight recently appeared in “Kennedy’s Children” in New York and Los Angeles, for which she received a Tony award. She also was in the television film “Twenty-One Hours at Munich.”Mary Ann Chinn is replacing Lesley Ann Warren in “Vanities,” which is continuing to run through the summer at Drury Lane Theatre/Water Tower Place. And Elizabeth Farley replaces Elizabeth Ashley in the same production through July 16. During this period, Ashley is filming a movie.(Continued from Page 1)generous in aw’arding huge purses.THE MIDDLE KINGDOM Grand Tourney is this Saturday through Monday. The King’s warriors will defend the crown. In addition to these staged battles, regularly scheduled medieval martial arts skirmishes will continue throughout the three days.A $1000 purse will go to the winner of a one-mile cross-country horse race July 9-10. The public is invited to participate. The race is limited to quarter horses and a $25 fee is required. Already 26 persons have entered. It's not too late to sign up. But riders must be in costume.A sand castle competition is scheduled July 16-17. The builder of the best Gothic through baroque style castle will receive a $200 purse. Construction begins Saturday with the final judging on Sunday.Robin Hood and his band of merry men arrive on the scene July 23-24 to host ballad singing, eating and log contests. On Sunday the king’s foresters will challenge Robin’s men to a tug-of-war. Women who have felt they were bom centuries too late can enter the Fair Maid Marion's Fairest of the Faire Contest.DURING THE FIFTH weekend of the faire, July 30-31, a decathlon will be open to the public featuring such events as javelin, cross-country running, wrestling and a stone throw.A human chess game and boar hound (Great Dane) show are scheduled for Aug. 6-7, the final weekend of the faire.Hours are 11:30 a.m. - 6:30 p.m. Admission is $4 for adults; $1 for children 5-12; children under 5 admitted free.To reach the grounds, drive north on Interstate 94 (the Tri-State Tollway), exit at Russell Road, follow signs for almost a mile to the site. Further information and specific times for scheduled events are available throueh 689-2800.