@silverpill The brunt is of the hackathon is taking place IRL, so people will simply need to register and be present to participate. There is no need to be involved in Discord, Twitter, etc.
There are many avenues to participating in improving Monero, so while this option might not suite everyone it is still a valid for some.
A anon user can participate in Monero R&D or hacking through other outlets such as the Community Crowdfunding System or https://bounties.monero.social