Adding Css Class to list of events

Hi, thanks for the plugin. I would like to add a unique class to each column in the grid list.

e.g. <div class=”mep-event-list-loop column_style mep_event_grid_item mix”>

I searched the plugin code and tried a few filters and action hooks but I cant seem to find anything that I can use to add a unique class, so I can individually color code each column in the list.

Is there a filter or action hook I can use ?

Thanks, Julie