Yeah and being nostalgic around people who don't share it is difficult, since if you talk about it then they will find you insufferable.
Unrelated but I can remember when a friend of mine came back from a long, glamorous trip and suddenly stopped sharing in our usual moments of nostalgia. They acted like they were embarrassed. It sucked because it made me believe that they were ashamed of who they used to be, and I felt sorry for them. This person has since made great efforts to adopt a newer, more glamorous persona. I miss when they were genuine. I miss my friend.
I met with some old college friends and we were discussing some of our antics at the time. I sort of cringed when being reminded of the lame stuff I had been doing at that time. That was me then, and now I'm a different person. I don't think I'm not being genuine though.
Most of these festivals are more about shared nostalgia than objective appreciation of technology from a specific time.
Like watching one of those videos from LGR. Watching him power up an old computer and hearing that "thunk" sound is beautiful.
And slighty offtopic, but I think nostalgia is fun when shared with people. Being nostalgic alone is a mix of warm and sad.