In my (future) website, every activities turn around marathon and I need a seamless navigation between ES/ED/EB

Typically,
- from the home page, a member search for 'london' and go to the Group 'London Marathon', see information about the related Event (date of the London Marathon, etc.), discuss into the group ..
- but he would like also to read 'London marathon stories' written by other members who ran the London Marthon few years ago

So,
- I need a 'link' from the London Group (ES category) to the London Stories (EB category)
- and vice-versa

The app https://stackideas.com/apps/item/2937-group-blog go in this direction : "This app will enable the option to create your blogpost from any of your EasySocial’s group pages. The created blog post will be linked to your EasyBlog’s page."

Any other 'links' between our 3 components ?
The workaround could it be to add a custom field filled by the relevant link?
For exemple : in the Blog of category 'London Marathon' (for all stories about this marathon), I will add a link to the Group 'London Marathon' ...