Can the same event data appear multiple times in a GEDCOM file?
Yes. For the most part FO will handle this ok. For example you could have multiple BIRTH entries in a GEDCOM file and FO will import all of them. In some cases FO will ignore multiple entries but you should see an entry in the list file. Many other program do not support multiple entry of facts and will produce undefined behaviour usually keeping only the first or last of the supplied entries and may or may not report this.
