Queen Elizabeth is also due to attend the inter-denominational service in Armagh later this month.
Its reported several Fianna Fail TDs are angry at the govnerment's decision to send two ministers to a church service to commemorate the partition of Ireland.
The Sunday Times reports that the TDS, who include Barry Cowen, Brendan Smith, Willie O'Dea and Niamh Smyth, say they're getting a backlash from constituents over the decision.
Foreign Affairs Minister Simon Coveney and the Fianna Fail government chief whip, Jack Chambers, are due to attend the event, which President Michael D Higgins has refused to attend.
Queen Elizabeth is also due to attend the inter-denominational service in Armagh later this month.

Horse Believed To Have Been Driven At Gardaí During Citywest Riots Found Collapsed And Injured
Man Appears In Court Over Alleged Assault On Woman Campaigning Alongside Sinn Féin Leader Mary Lou McDonald
Speculation Grows Over Micheál Martin's Future As Fianna Fáil Leader
Higher Fuel Bills This Month As Petrol And Diesel Prices Edge Up Again
Man (20s) Seriously Injured During Alleged Assault In Kildare Town Was Found Unresponsive At 3.15 This Morning
Tóibín: “ Extreme” Views Highlighted In Secret WhatsApp Groups Will Not Be Tolerated, As He Points To Diversity In Aontú
Gardaí Investigate Alleged Attack In Kildare Town
“And My Daughter Won’t Like Brown People”: Aontú Fires Kildare Youth Leader Over Racist Messages