THE CELEBRITY SKIING TALENT AT THE Race to Erase Multiple Sclerosis in Aspen last week was only so-so. "I was just hoping to gel down alive," said Michael Bolton, who schussed to second place in his heat. But check out the après ski scene: Hap star Hammer hosted an impromptu dance clinic. Bolton and Kenny G performed at a black-tie ball. And best of all, says host and MS sufferer Nancy Davis (whose dad is oil billionaire Marvin Davis), $1.3 million was raised for MS research.