The Events Calendar: Include Legacy (v1) List View at the end of each post's output unless it's a TEC post or archive.

functions.php

/**
 * The Events Calendar: Include Legacy (v1) List View at the end of each post's output unless it's a TEC post or archive.
 *
 * Tested working with TEC v5.1.1.
 *
 * @link https://gist.github.com/cliffordp/98d438e52a1a95a9fea3e862c426b399 This snippet.
 *
 * @see  \tribe_include_view_list() The same function used by Organizer and Venue archives in Events Calendar Pro (v1 views).
 *
 * @param string $content
 *
 * @return string
 */
function cliff_add_tec_v1_list_view_on_post_loop( $content ) {
	if (
		! function_exists( 'tribe_include_view_list' )
		|| ! function_exists( 'tribe_is_event_query' )
		|| tribe_is_event_query()
	) {
		return $content;
	}

	// We're too late to do this in the Content filter, but it's a reminder you may want to do this in your custom code.
	// tribe_asset_enqueue( 'tribe-events-ajax-list' );

	// Not passing 'eventDisplay' unfortunately causes PHP notices [BTRIA-378].
	$args = [
		'eventDisplay'   => 'list',
		'posts_per_page' => 3,
	];

	return $content .= tribe_include_view_list( $args );
}

add_filter( 'the_content', 'cliff_add_tec_v1_list_view_on_post_loop' );