It's a shame that engineers don't like free stuff. If they did, Sakthi's tip about the upcoming JRuby Hack Day would be perfect. Experts from Sun and Joyent will show how to develop and deploy JRuby applications on GlassFish (to get some impressive performance and scalability results [1, 2, 3]). A catered dinner and open bar will also be provided.
But I'm sure none of you would be interested in getting all of that for free. So you won't need details like the time (August 8), location (Axis Cafe in San Francisco), or registration page (hurry to guarantee your spot).
Like I said--it's a real shame. ;)