cbwjm
Seb-wejem
I think for a sandbox like campaign where you've sprinkled various short adventures that there is no need to mention what the adventure is, ideally they should find out in game if they have a chance to find out about Raven's ruin but even then they don't necessarily need to know it is a specific module. After all, if you're homebrewing most adventures there isn't much you'd mention first about them.