Actually, the snow fest starts on 2 Dec, 10.30am-3.00pm at North Straub Park. Wristbands for $5 for all activities, don't know about Santa Clause appearing.
Usually they do have some type of holiday themed event. When the complex was Bay Walk they had Santa but I'm not exactly sure as far as SunDial.
Should be the 1st or 2nd weekend of December like last year for Santa to show up at sundial. Next time I walk by I'll ask one of the guards.
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