I figured it out.
If you uncheck “debug queries” it will disappear.
Checking that calls this function in several places:
function rsvp_printQueryDebugInfo() {
global $wpdb;
if(get_option(OPTION_DEBUG_RSVP_QUERIES) == "Y") {
echo "Sql Output: ";
$wpdb->print_error();
echo "";
}
}
Turning it off prevents the statement from being printed.