[FEATURE] List OCC conducted/planned in the events list

[LilSuperUser]

Description

Right now, the events list on thefossclub.org doesn't show the Open Community Calls (OCC).

We should list the OCC conducted and planned by us under the events list.

Proposed Solution

Create a folder type structure, which when clicked shows a list of all the OCC conducted and planned along with relevant images and date/time.