I'd recommend bringing some bug repellent gear. Maybe some of those little standalone units, not the spray. The kinds that are used for big open areas for outdoor activities. I don't even know how effective they are though... or if they even exist.
I went to Stafford Lake Park for BAM (as finch1750 mentioned) a few years back, and it was a really hot day and the flies were out in full force, trying to eat your delicious BBQ. It was a great event, other than the extreme heat (near 100 I think?) and the flies everywhere.
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