As far as I know all projects have their own secrets. How is it possible to assert so strongly that all the projects discussed will later become ill-known?
Thats what experience has taught me, the older users of this forum have all invested somewhere sometime in some altcoins and they have only lead to a deprecation of the asset in the long term instead of going up, unlike what an investor would expect. They did spend time to hold and be patient about it but the project either shut itself off or ghosted its investors. In any crypto related event you can find these altcoins showing off their new product and their token or coin, but be assured that it would never be the next bitcoin.
It's just an event and if you don't dare to go, it makes no sense to expect bitcoin to become ubiquitous and become a means of payment globally. Because then you will be using bitcoin all the time and everyone knows your identity. Privacy is lost as bitcoin becomes ubiquitous and is used every day.
An event does not change the public adoption, most people go there to have the free lunch or meet with some potential investors to get money. How you use bitcoin and protect your identity is your own choice and it can be done if you are clever enough.