Would I use [ESPRESSO_CALENDAR event_category_id=your_category_id=false? is there a “does not equal” parameter or a NULL parameter? The only hint I see is that customization allows to exclude STATUS
2 Can I use [ESPRESSO_CALENDAR event_category_id=your_category_id] for multiple categories, for instance if I want to create FREE/PAID/Other and only show FREE and PAID