The project test suite (run by bundle exec rake spec) shows that not all of the exported data files are valid - particularly some of them contain multiple celebrations (other than optional memorials) on the same date.
try to find official sources for the calendars in question
if romcal's data turn out to be incorrect (by comparison with the official source), open a PR with a fix for romcal
if there's a reason why romcal's data are the way they are, prepare some kind of workaround in the export script
The project test suite (run by
bundle exec rake spec) shows that not all of the exported data files are valid - particularly some of them contain multiple celebrations (other than optional memorials) on the same date.