Hey @Gary!
To address your question reverse order, yes it is safe to relabel “Organizer” and “Organizers” as directed by this Knowledgebase Article → https://theeventscalendar.com/knowledgebase/relabeling-the-venue-organizer-sections-in-event-meta/
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As for adding meta, there’s honestly nothing special about the Organizer post type and so the standard WordPress methods for adding, updating, getting, and deleting meta are all the best methods to use.
The most basic methods here are get_post_meta() and update_post_meta(), which you can read more about here:
• https://developer.wordpress.org/reference/functions/get_post_meta/
• https://developer.wordpress.org/reference/functions/update_post_meta/
Other articles about those functions are linked from those pages, so explore all the associated reading there if interested.
I hope this helps! 😀
George