Margaret O'Carroll was famed for her hospitality. She was especially remembered for providing two magnificent feasts in 1433: one on 26 March at Killeigh, Offaly and one on 15 August at Rathangan, Kildare. According to the "Annals of Connacht" on 25 March 1433 'A general invitation was issued by Mairgreg daughter of O Cerbaill about the feast of Dasinchell this year at Killeigh, and [another] about the first festival of Mary in the autumn at Rathangan for the people who were not with her at Killeigh, so that she satisfied fully all the suppliants of Ireland'. In an obituary for Margaret found in a seventeenth-century translation of a set of Irish annals, Duald Mac Firbis provides more elaborate details as to the events of these two feasts. According to Mac Firbis, 2,700 people were entertained at the first feast and 'Maelyn O'Maelconry one of the chiefe learned of Connaght, was the first written in that Roll and first payed and dieted or sett to super'. During the feast, Margaret stood on the battlements of the church 'clad in cloath of gold' while Calbhach was on horseback below ensuring that 'all things might be done orderly'. Margaret is also said to have fostered or nursed two orphans during this feast. The second feast that year is said to have been just as impressive as the first. In addition to her great feasts, Margaret O'Carroll also went on pilgrimage to the shrine of Saint James of Compostello in Spain in 1445. Margaret joined a group of Irish and Anglo-Irish aristocrats on this journey that included Mac Diarmada, chief of Moylurgh (Co. Roscommon), Mac Eochacáin, chief of Cemél Fiachach, O'Driscoll Óg, chief of Collybeg (south-west Co. Cork), Gerald Fitzgerald and Eibhlin fitz Thomas Ó Fearghail. Only Margaret, Mac Diarmada and Mac Eochacáin made the trip safely. Both Gerald Fitzgerald and Eibhlin fitz Thomas Ó Gearghail died in Spain and O'Driscoll Óg died at sea on the journey back to Ireland. In addition to her pilgrimage, Margaret commissioned the making of a number of roads, bridges, churches and missals in order 'to serve God and her soule'.