[Philip Urech]

Thanks Patricia for the input. Ran WP_DEBUG and WP_DEBUG_LOG:
define(‘WP_DEBUG’, true);
define(‘WP_DEBUG_LOG’, true);
define(‘WP_DEBUG_DISPLAY’, false);
@ini_set(‘display_errors’, 0);

Found that error 500 was due to php memory allocation issue:
[09-Oct-2017 12:25:19 UTC] PHP Fatal error: Allowed memory size of 134217728 bytes exhausted (tried to allocate 7680 bytes) in /home/skbe/public_html/go/wp-content/plugins/woocommerce/includes/admin/class-wc-admin-notices.php on line 59

Increased WP_MEMORY_LIMIT:
define(‘WP_MEMORY_LIMIT’, ‘256M’);

Site is working again. DONE 🙂

[Philip Urech]

After changing the theme from Make to the standard Twenty Fourteen theme, I could activate the Event Calendar plugins. Therefore the issue seems to be an incompatibility between Make theme and Event Calendar plugin, arising from the update of the Event Calendar plugin. Please inform me if you plan to modify the Event Calendar plugin any time soon. Thx

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