This is the advantage in crypto or blockchain technology. Conferences is just a bonus to disseminate the information/knowledge about crypto. We can always do it online or search online what it is all about. This technology is not dependent on conferences. They are only holding these events to connect potential investors, customers or stakeholders. So I am not worried also with the halt of conferences.
In terms of mining equipment, the OP has no source where he got the notion that China totally stopped the production. Now, that Wuhan is open. I don't think manufacturing companies are still shutdown. They are slowly going back to normal life.
Mining farms may need employees to solve technical problems of the mining rigs or to mount new ones, but they probably aren't needed very often or even if they would be needed on a daily basis, the mining farms won't ever be overcrowded. In fact, supermarkets are more likely to be overcrowded during a lockdown than a mining farm. But we're talking about the Chinese authorities, so expect anything..
Conferences will be held again after the lockdown gets lifted (hopefully). If they wanted to hold a conference,
even if they wanted to do it by live-streaming it without any spectators physically being there, they still should've gathered crypto personalities from all around the world. They'd probably all travel by air, and so on. Risks increase, obviously. So cutting off the conferences for now isn't a big deal imo.