Apache and Open Office are present each year at FOSDEM, at the end of january each year in Brussels.
And some Apache Maven team members living near Brussels take that opportunity to meet and have a good beer
FOSDEM 2017
CfP: https://lists.fosdem.org/pipermail/fosdem/2016-October/002482.html (1st of December 2016 - Call for Paper Closed)
We should probably try to join the LibreDinner as well.
...
FOSDEM 2016
Robert talk on Java 9, meeting with Mark Reinhold, discussion with Mike Millinkovitch about transition of Aether from Eclipse to ASF
FOSDEM 2015