Why not a straight forward " no " instead of " I don't remember " ? It cuts no ice with me when someone states that they don't remember---------unless they're in their 90's.
I'm always interested in what people tell me they remember. My friend's daughter, because she remembered telling her, insisted that her mother knew something from years back. Her mother didn't. It appears quite simple to me. Clearly, because she felt the need to relay the tale to her mother, the story had impacted heavily on the daughter. It didn't have the same impact on the mother so she didn't retain it. It's hardly surprising then, if those present at WHF, can't recall, with clarity, every detail of it. I'm certain they'll recall that which impacted most heavily. What's important to us, in the here and now, may NOT have been as important to them, at the time.