We now have a community Gypsy Jazz Calendar
that everyone can list their events on. I encourage you to list your events both here in the forum, as well on the calendar which is here: http://www.djangobooks.com/blog/calendar/
You can have any Gypsy jazz related event listed in the calendar by submitting it via the "Post Your Event" link on the calendar page. If you maintain an online calendar for your band that produces an ICS calendar feed (i.e. Facebook and Goolge calendars will do this) you can submit the entire feed so that everything you add to your own calendar gets automatically added to the community calendar here.
This should be a great way to provide a central place for those looking for Gypsy jazz related events world wide.