@Reban- Closed group will be the better option here. Only the members who have joined the group can access the files. Here is a documentation https://community.lithium.com/t5/Groups/Create-groups/ta-p/109541   The second option you can have is to create a private board for this and give access to only those users who have attended the event. But for this you need to know the usernames and need to give a role to each memeber.   Similar thread - https://community.lithium.com/t5/Online-Communities/Creation-of-Private-Group-Forum-Category-help/m-p/466343#M5091   ... View more

Here on the Lithium Community we had a slightly different challenge asking for a very similar solution: we have product related content (discussions, blog, ideas, documentation, developer docs) spread over a structure organised by interaction style. We decided to create product hub pages which summarise links and latest content from the various areas that deal with a certain product. Here's the one for "Online Communities":  https://community.lithium.com/t5/Online-Communities-Product-Hub/bd-p/online-communities   We started using Lithium built message and list widgets. These only show content within scope of the current community position. That's why we created custom components that allow listing blog articles and messages from any node id that's passed via component parameters.    In your scenario you could take the same approach to create landing or hubba gesture that act as summaries for latest blogs and discussions. Ideally you should think about highlighting community members from these areas as well. These could be most Kudoed, most solution provided or even SMEs for that product.  ... View more