OH, WE CAN'T WAIT: If you don't like a spoiler, then look away, but the day's delights include an appearance by author James Davidson, who shall be signing his book "Hal Ashby and the Making of Harold and Maude." As for that Jaguar hearse out front? That of course was Harold's sleek and spooky ride in the film. To see the famous vehicle, famous rail car, and maybe flaunt your Harold-esque, wide-of-tie style, make for the museum from 10:30 a.m. to 5 p.m. (Mr. Davidson is signing books from 11:30 to 1 o'clock). Whether you're able to make it or not, best always take what Maude recommended to Harold upon his declaration of love for her to heart: "Go and love some more." Wise words, for sure, dear Maude.