Monday at 23:59 UTC is the latest time to upload tarballs for inclusion for GNOME 2.21.92 (the release candidate). However, we’re aware of FOSDEM. That is why we will be more lenient if you inform release-team@gnome.org beforehand. Note: with lenient I mean that you’re allowed to release tarball slightly later, or that you request us (r-t) to create the tarball.