You can bring any or all of those things...there are a few shaded areas on the lawn...under trees, if this is an afternoon concert.
YES to the small umbrella and beach chairs. Don't know about a beach tent.
When I went there a few weeks ago people had full picnics on the lawn. they were setting up with their own coolers and food. Chairs and umbrellas should be fine as long as you don't set it up right inn front of someone
Well on my experience I've seing it all people bring chairs tents umbrellas liquor refreshments food
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