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I do not believe you have a case. Essentially you would be suing them for failing to make a gift. Since you were volunteering you would not be able to suggest this was pay or compensation for your services. As such there was no consideration on your part for the gift, and thus it could be revoked at their discretion. Your inability to get credentials would be a valid reason to revoke the gift. In as much as you don't have a right to any of those things, likely can't show damages you suffered in not going, and your "experiences" would have been highly speculative, there is likely no case here.
I hope this helps.
I agree that it would have been neat, but a die-hard democrat would probably say it was worthless. That's the problem with valuation - who decides, and that's why things like that are not recoverable.
That said, as far as the credentials, they too are a gift. Unless you can show that they were payment for your services, the fact that they broke their own rules in awarding them is of no moment. They simply failed to follow their own rules in awarding a gift and I don't think that is actionable. Put another way, I don't think you can show that you had a right to the credentials, only an expectancy, a hope.
Further, you can't show you were out any money in not going. You might have had a great time, but you might also have been killed in a plane crash and to that extent, they saved your life.
I know you are disappointed, but I don't think you have a case here.