It's Software Freedom Day on Sept 16th

"Software Freedom Day (SFD) is an annual worldwide celebration of Free Software organized by Digital Freedom Foundation. SFD is a public education effort with the aim of increasing awareness of Free Software and its virtues, and encouraging its use."

The FSFE is celebrating at c-base in Berlin: http://wiki.softwarefreedomday.org/2017/Germany/Berlin/JointSFDBerlin
The FSF has an open house at their Boston office: http://www.fsf.org/events/fsf-open-house-for-software-freedom-day
(so far no news from the other FSF's AFAIK)

Main link: https://www.softwarefreedomday.org/