WordPress database error: Character set ‘binary’ cannot be used

Hello! First off, thank you. I love your work.

I’m getting an error across the top of any admin page:

WordPress database error: [Character set ‘binary’ cannot be used in conjunction with ‘utf8mb4_unicode_520_ci’ in call to regexp_like.]
SELECT wp_posts.*, meta_value as sked FROM wp_posts JOIN wp_postmeta ON wp_postmeta.post_id = wp_posts.ID WHERE post_type='rsvpmaker_template' AND BINARY meta_key REGEXP '_sked_[A-Z].+' and meta_value AND post_status='publish' GROUP BY wp_posts.ID ORDER BY post_title

On the user side, any page that has RSVPmaker components displays as a blank page. Which is kinda scary cause it’s the whole events section.

I didn’t make any changes on my end. This message and behavior was there when I logged in today, after a few days of inactivity.

Do you have any suggestions I could try?