“ A casual remark by one of the party about something met on a previous adventure leads to a summons to and grilling by the Mages' Guild (or equivalent), probably resulting in an expedition back to that area to recover the things for study by the Guild. The party's presence will be 'requested' for this expedition.”
“ The Hierophant of Greenmarch is a lycanthrope. Rather than seeking a cure, or hiding his condition, he considers it a blessing from the Goddess of the moon, and requires that all of the Druids and loyal Rangers of Greenmarch to share in his gift.”
“ A nation state has a hardline tradition of transparency in government. So much so that any and all information held by their military and intelligence services is immediately declassified and published when the said information is no longer relevent to current and ongoing activities. Even if such information might be diplomatically toxic.”