Hello! I'm maintaining the Finnish translation of JEvents, only three months behind releases due to lack of money (can't pay for components). Here is the latest Finnish translation for 1.5.4. I always post them also to the Finnish Joomla users forum at joomlaportal.fi.
There is something funny about this version of JEvents: there are no discrepancies between the en-GB-language files and th fi-FI-language files but still some strings don't translate (like "Main Monthly Calendar" and some strings in Control Panel (JEV HIDE MIGRATION and a couple of others).
This is NOT an installation file, you need to unzip it locally and upload the "ylläpito" files to administration/language/fi-FI and "julkinen" file to language/fi-FI.