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I searched on the subscription site Roots Ireland but was unable to locate the marriage record even though Roots has the Tomacork marriage records prior to 1830. Here is a link to the parish register https://registers.nli.ie/parishes/0586 in case you want to look for the record. You will also note that there is a gap in baptismal records from November 1797 thru 1806. I was unable to find a good lead on a baptismal record for Margo or James and if they were from Tomacork parish possibly they were born in the gap period.
You may already have the record but I did locate a baptismal record for a brother James. See below.
I don't know if your James Bolger was still alive in 1854 when the Griffiths Valuation survey was completer but there is a James Bolger listed in Carnew. https://www.failteromhat.com/griffiths/wicklow/carnew.htm
Name:James BolgerDate of Birth:
Date of Baptism:23-Dec-1832Address:TombraneParish/District:CARNEWGender:
Sponsor 1 /
Informant 1:Michael Sumers?Sponsor 2 /
Informant 2:Rose Travis?