President Higgins later attended a 1916 commemoration concert at Liberty Hall Theatre .
Later that day , President Higgins gave a keynote address at a ceremony in the Royal Dublin Society and met relatives of the dead , 4,000 of whom attended .
President President later attended a 1916 commemoration concert at Liberty Hall Theatre .
Later that day , President Higgins gave a keynote address at a ceremony in the Royal Dublin Society and met relatives of the dead , 4,000 of whom attended .