Saint Louis Zoo Calendar of Events Saturdays & Sundays, September 20-21, 27-28, October 4-5, 11-12, 2003 St. Louis Metro Ford Dealers Ottertoberfest. Free fall family fun from 12 noon to 3 p.m. includes an otter adaptation activity for kids, docent talks and biofacts.   Enjoy live oom-pah music at the biergarten.  Beer and root beer, bratwurst, pretzels and other specialties will be available for purchase.  Activities located near River Camp Cafe.  Admission is free.  For information, 314/781-0900 or www.stlzoo.org.  Sponsored by St. Louis Metro Ford Dealers, TJ Maxx, Missouri River Otters and supported by Y-98 FM. September 25, 2003 Jammin' at the Zoo. The happy hour presented by the Young Zoo Friends will benefit the St. Louis Zoo's conservation efforts for the Grevy's zebra.  The wild bash takes place from 6-10 p.m., in the center of the beautiful Zoo grounds.  Enjoy live music from Poppies 3 and Gargoyle Reign.  Food and drinks will be available for purchase.  Admission is $5 per person and free for Zoo Friends members.  Enter the Zoo at South Gate near Hwy. 40 and Z-O-O pylon.  Free parking on the south lot.  No reservations needed.  Ages 21 and up only.  Event is rain or shine.  For information, 314/768-5440 or www.stlzoo.org/yzf.  Sponsored by St. Louis Magazine and 101.1 The River. October 8, 2003 St. Louis Zoo Friends Speaker Series: "Adrift in a Sand Sea: Conservation Efforts of Desert Antelopes in Northwest Africa."  Bill Houston, Zoo's assistant general curator, will share the mystique and surprising beauty of the Sahara and its inhabitants as well as his thoughts on what can and should be done to preserve this region.  Doors open at 7 p.m.; lecture at 7:30 p.m. in The Living World. Free for Zoo Friends members; $5 for non-members, $3 for students/seniors. Reservations are required.  For reservations, call 314/768-5450. Sponsored by St. Louis Zoo Friends Association and supported by 550 KTRS.