Hey A K,
Thanks for following up with us here! I’d be happy to help get you pointed in the right direction for this one.
To start, you’ll need to do a little customization to the sites where the events are coming from – the site that does NOT have the iCal importer installed on it.
What you’ll need to do is add a function to the functions.php file within the child theme activated for that site. This function will allow for you to add a variable in addition to the “?ical=1” to the query string for setting the category on the URL that is added to the import settings on the site receiving the events.
Take a look at the snippet here https://theeventscalendar.com/support/forums/topic/pull-feed-from-event-category-from-one-site-to-another-site/#dl_post-1135922
This should be what you’re looking for and what would need to be added to the source site functions.php file.
Let me know if this helps.
Thanks!