Just to start the ball rolling... here are the events I currently know about. Will add more or update as more info becomes available.
Biking Blitz Series - http://www.biking.ie/bikingblitz.ie/
12th Feb - Ballinastoe
26th Feb - Ballyhoura
12th March - Derroura
26th March - Ticknock
XC NPS - http://irishxcnps.ie/
30th April –Tracton Woods, Co Cork
21st May - Slade Valley, Dublin
4th June - Bellurgan, Louth
25th June - Ticknock, Dublin
9th July - Union Wood, Sligo
XCO Irish National Championships
23rd July in Leinster - Djouce (tbc)
XCM Irish National Championships
Mid September, venue to be confirmed.
Gravity Enduro http://www.gravityenduro.ie/
Round 1, 22nd - 23rd April, Ballinastoe, Wicklow
Round 2, 17th - 18th June, Ticknock, Dublin
Round 3, 29th - 30th July, Mt Leinster, Carlow
Championships, 19th - 20th August, Carrick, Wicklow
Round 4, 9th - 10th September, Djouce, Wicklow
Other events / sportives
Emerald Enduro - 27th-28th May, Carrick, Co Wicklow
Cooley Thriller - August
Nire Valley Drop – October
2017 MTB races and events
Re: 2017 MTB races and events
To add to the sportives, Ballyhoura challenge Feb19th and the Burren Challenge, North Clare. October.
Re: 2017 MTB races and events
Jaysus, your going to be a busy man this year David doing all those races..