Spring Days are a 2 day developer community event for the Spring community, by the Spring community. In 2017 events will be in Chicago, New York and Atlanta where there are active Java developer communities and strong local economy. Note that the pricing below is on a per-city basis.
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Spring Days Chicago is expected to draw 200-400 Java developers. Local Java user groups in Chicago are also active and sizable. CJUG has 2,010 members, and Illinois JUG has a number of regional chapters.
Spring Days New York is expected to draw 200-400 Java developers. Local Java user groups in New York are active and sizable: NYC Java SIG alone is 7800 members, and the local NYC Java Meetup has about 9,142 members.