Multicategory for single events requested

Hi,
I'm searching for a solution that gives me the oportunity to create one single event and connect it to different categories.

Maybe, it's easier if you take a look here: <!-- w -->www.lenotegolose.com/index.php<!-- w -->

I have different companies represented, one category calendar for each company. The events usually use products from more than just one company, so I basically need to show "category" event in the single company page but all the events (and the companies connected) in the link "EVENTI".
If I duplicate the events in every category, the prob is taht the "EVENTI" latest events module will show one event repeated twice or more times..

Is it possible someway to find a solution with jEvents?
Do the bronze/silver/gold account lead to something like that?

Wait for you
thanks
S.