Although this looks like a vendor-specific event, Ping Identity seems relatively big in the Security and Identiy market, so maybe a few of us (especially those at Oracle if they're allowed to go) could find this event interesting. There are 3 in San Francisco, New York and London. The ~300€ price tag looks reasonable if you compare it to e.g. JavaOne.
Maybe an opportunity to raise awareness about JSR 375.
I have not used it so far myself, but Ping Identity does offer Java Integration: https://documentation.pingidentity.com/display/LP/Java+Integration+Kit+2.4.2