Thanks for the photos! Those of us less fortunate to attend in person appreciate it
In particular, that C128 which was a raffle prize exhibits extreme yellowing. My C128 doesn't look as nice as I would like (or remember) despite reasonable precautions... and I've seen many C128's worse than mine... but that raffle prize is really bad. It looks like it was in a bar (think tobacco smoke thick enough to cut with a knife) for the past 20 years. ... Presumably that is the reason it was donated/raffled away! I hope it went to a good home for the rest of its life [if it gets any more yellow it would be brown]
I also enjoyed the Plus/4 and PET photos. Not because they were mind blowing but because you (or at least I) don't see a lot of stuff done with them these days... nice to see the love for them.
I also like the ones with piano/keyboard attachment (mostly Amiga setups). I've learned enough about MIDI to be dangerous, but haven't found the time/courage/money to invest in C64/128 MIDI setup. In other words, I'm jealous...
It must be an EXTREME lighting issue. The photo I linked (from your site) clearly shows in the background a white (presumably 'pure' white) placard/description. Also visible is other vintage computer equipment ... is that a PET? I'm not sure... it is a bit yellow (compared to the 'white placard'), but not very yellow like the C128 'raffle' prize.
In other words, I find it hard to believe -- as a 'noob' -- that yellowing is simply due to 'bad lighting' (mainly because of the other colors available for comparison)
However, I have seen some REALLY strange photos by digital cameras that contradict my (and others') human visual perception.
So if you saw it with your own eyes and attest to us that the C128 was not yellow (or not particularly yellow) then I will take your word... and conclude that camera used has a great 'prediction' for the future color of C128s
[FYI there could be some profit in predicting the future with that camera]