line 212:
if ( ($config['publicevents'] == 1 && $user['U_Status'] = "Administrator")
of course should be $user['U_Status'] == "Administrator"

because of this error users get option "add event to calendar" even if $config['publicevents'] set to 1 or 2

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Thanks for the report, and fix.

You mean editpost.php, eh? Thanks for the fix

This one is fixed in 6.5.3