Inspired by Nullmaruzero's post I made a calendar for WoT, which shows all events in given month.
You can check it out here.
If a month hasn't yet come, whole calendar is gray:
But later, every day of the month and available events will be coloured automatically:
Please note that dates are corrected (eg. 3rd to 8th October means 3rd October 6:00 to 9th October 6:00).