Bay seniors get out your dirndls, your clogs and your leiderhosen. You’ll need them on Sunday May 17 on the alpine slopes of Mt. Tamalpais. The Touristen Veren de Naturefreund is holding its annual Maifest from noon to 6 in their lovely chalet and serving classic German/Austrian food and drink. Of course you’ll enjoy the traditional Schuhplatter folk dancing. $20 tickets available only in advance. This 100-year old authentic Tyrolean lodge is a private club except for their three annual festivals.