Hi folks,
Another way of approaching this is: we do have a standalone “is this event online” filter checkbox that you can see referenced in /livewhale/theme/core/components/calendar/lw_cal_categories.html:
<div id="lw_cal_online_selector" class="lw_cal_selector"></div>
That online selector we typically theme inside of the “categories” dropdown, but actually it doesn’t need to live there, it could go anywhere. (The checkbox itself is themed using the calendar component lw_cal_online_selector.html if you want to redesign or reword it.)
So, Rob, if your theming already has a component filtering by location, you could add or move that lw_cal_online_selector into the top of that, and the Online events checkbox would go there instead. Hope this may help!