There will be a Lucene meetup next week at ApacheCon (AC) in Oakland on Tuesday, November 3rd. Meetups are free (the rest of the conference is not). See: http://wiki.apache.org/lucene-java/LuceneAtApacheConUs2009
For other meetups at ApacheCon, see http://www.us.apachecon.com/c/acus2009/schedule/meetups
Also, note, we have a lot of Lucene/Solr related content scheduled for ApacheCon including Lucene and Solr training (Monday and Tuesday), two full days of Lucene related talks on Thursday and Friday, plus the Meetup. I also know there will be a lot of Lucene ecosystem committers at AC this year, so it's a great way to interact with people working on your favorite Lucene projects. See http://www.us.apachecon.com
for more info on the conference.