The highlight of my holiday season was Richard Holbrook's Holiday Chestnuts from Christmases Past and Present. It was the perfect way to plunge whole-heartedly into the very best of the season, with its sentimentality and joy in plain sight. Holbrook has a sincere, engaging presence and treats his audience as old friends, which, no doubt, filled some of the packed houses. Old-fashioned in the very best sense, this is…