I'd have to agree. In any kind of digital imaging it's much harder to correct an over exposed picture than an under exposed one. You can extract details from the blacks much easier than you can from the whites.

By all means apply some adjustment filters i.e. brightness, contrast, levels etc and have a play. You will probably get it 'better' than it is but I suspect you will not get the level of satisfaction you are hoping for.

My suggestion. If the 'event' is repeatable then reshoot it. Sorry.

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