Join the Conference Newsgroup (called “Java Posse Roundup” for historical reasons). General announcements are made through the newsgroup. Make sure you use the email address where you would like to receive information about the conference. That is, use the attendee’s address and not an admin’s address. This address will not be used for anything except the conference.
Join the Conference Slack channel. You can post questions to the Slack channel, arrange ride sharing, group house rentals, etc.