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I couldn't find any relevant information about a restaurant named "Glen Helen Amphitheater". It appears to be an outdoor music venue, not a restaurant.

However, I found some information about Glen Helen Park, which is a large outdoor recreational area with facilities for concerts and other events. The venue hosts various festivals and concerts throughout the year.

If you're looking for a restaurant in the San Bernardino area, please provide me with more details or another location, and I'll be happy to assist you with an engaging summary introduction.