Set Default State/Country in Community Events plugin from The Events Calendar

mu-plugin.php

<?php
/**
 * The Community Events plugin offers a "Single Geography" mode but no way
 * to specify the default State and Country to use for venues created when
 * it's enabled.
 * 
 * Note: Events Calendar PRO allows specifying a default State and Country
 * but that shouldn't be required to use Community Events!
 */
namespace SiteName\CommunityEvents;

add_filter( 'tribe_events_community_sanitize_submission', __NAMESPACE__ . '\add_default_state' );
/**
 * Set State and Country defaults for all Venues submitted through Community Events front-end form
 */
function add_default_state( $entry ) {
  // check if the State has been set by the 
	if( empty( $entry['Venue']['State'] ) ) {
		$entry['Venue']['State'] = [ 'WA' ]; // Use two-letter state abbreviation
		$entry['Venue']['Country'] = [ 'United States' ]; // use spelled-out country name
	}
	return $entry;
}