Those event's are important if you want to get involved in new technologies involving the blockchain, there you can learn a lot of topics like NFT, Staking, Smart Contracts, Security, and all the relevant topics for the blockchain.
And the most important is how those events are used to introduce new technologies involving blockchaing. So, I don't say we need to be in every blockchain even, but at least we can see the conference topics and if we find something interesting then it is worth being part of it.
in my opinion, if you have a business and you want to connect with the right people, this is worth to attend to. but if you are just a regular crypto user, you can always learn things over the internet. but it is your prerogative if you want to mingle with people who have the same interest. also, if you can afford to attend such events, why not? this will be added experience for you and learn other things that you can't get over the net.