In addition to updating Enfold yesterday, I also updated the The Events Calendar. I now suspect that the source of the problem is with that plugin. Thank you!

I don’t see those exact lines, but I see similar code beginning around line 420 of wp-content/themes/enfold/functions.php

		//load mediaelement js
		$opt_mediaelement = isset( $options['disable_mediaelement'] ) ? $options['disable_mediaelement'] : '';
		
		$condition = true;
		if( 'force_mediaelement' != $opt_mediaelement )
		{
			$condition  = ( $opt_mediaelement != "disable_mediaelement" ) && av_video_assets_required();
		}
		
		/**
		 * Allow to force loading of WP media element for 3rd party plugins. Nedded for wp_enqueue_media() to load properly.
		 * 
		 * @since 4.1.2 
		 * @param boolean $condition 
		 * @param array $options
		 * @return boolean
		 */
		$condition = apply_filters( 'avf_enqueue_wp_mediaelement', $condition, $options );		
		
		$condition2 = ( version_compare( get_bloginfo( 'version' ), '4.9', '>=' ) ) && $condition;
		avia_enqueue_script_conditionally( $condition , 'wp-mediaelement');
		avia_enqueue_style_conditionally( $condition2 , 'wp-mediaelement'); //With WP 4.9 we need to load the stylesheet seperately

Are there edits I make to this code block to allow mediaelement.js to load?