I remember that at my grandmother's house coffee time was not something that came alone, no, coffee time always came with other things like cake, cake mix, sweet bread and some other accompaniment.
So if I had to answer what I would share in this party... if you bring the coffee, I would bring the accompaniment for the party.
What would I bring?
For those with a sweet tooth, a good cake to cut and share among several of the attendees.
As there are a thousand and one tastes, there are people who like to drink coffee with very sweet foods, so that the coffee tastes bitter. So to those people I would bring this kind of sweets.
I remember that I found those candies in a cafe, so I took a couple of pictures of the shelf where they were.
On the other hand, for those who like something more homemade and crunchy, there is also something very tasty, buñuelos. These are very tasty cassava fritters, they are sweet and are dipped in caramel so they would be a very good accompaniment to the different types of coffee that you would bring....
Note: All photos are my property.