Dance Class, Introductory Ballroom Waltz, 5 sessions, March 22 through April 5. Sundays at 5 to 6:30 pm and Wednesdays at 6 to 7:30 pm. For new dancers and those wishing to improve their skills. $40 each for entire series; couples, $70. Call 314-4269 or 250-5338. Advance registration encouraged.