Search and Discovery of User-Owned Data (EU funding)

I would like to draft a proposal to NLnet foundation to do some R&D on search and discovery of user-owned data and I am looking for input from you.

As use case, I am thinking about searching for public events, like meetup, using OI Calendar that can be hosted on different servers.

Some questions were mentioned already, like:

Deadline is 1st April. (Let me know if you would like to do collaborate.)

What comes to your mind?