1) Public holidays, also safe created holidays should be written in upper case. E.g. I Love Free Software Day.
2) British English to be used as general rule. The noun "licence" (verb and derivatives must be always "license") is to be used if inside a news item, but not when used related to a more "international" project (such as REUSE, where US spelling "license" should be used). When it appears as a part of the licence name (e.g. GNU General Public License) or inside the title of a conference/external page, it should be left untouched.