Seachtain na Gaeilge has even won support from an astronaut this year.
Born-again Irishman, Commander Chris Hadfield, features on a video promoting the events.
He says: 'Is leatsa í, mar sin úsáid í' ('It's yours, use it.')
Last year, Commander Hadfield put Ireland on the map with the first tweet from space as Gaeilge: "Tá Éire fíorálainn" (Ireland is beautiful).
This year's Seachtain na Gaeilge ambassadors are Dublin footballer Ciarán Kilkenny, TG4's Máire Treasa Ní Dhubhghaill, and Lynette Fay of BBC Radio Ulster.
Thousands of events have been organised, including Saturday's national opening in Killarney, a street festival with a free concert, and Rith 2014 – a national relay run from Cork to Belfast.
On Saturday there will be a match at Somerton GAA pitch in Dublin between Ciarán Kilkenny's club, Castleknock and the Irish-speaking club Na Gaeil Óga.