addGroup() addGroup(integer $id) Filter by group. Parameters integer $id Presently requires the internal node ID, not the uuid.
addCountry() addCountry(string $country) Filter by country. Parameters string $country Country code. Generally ISO, but there are additions. @todo Make a query or a list for this.
addMonth() addMonth(string $month = 'now', string $year = 'now') Filter by month. Parameters string $month Optional: month in MM numeric format. Default current month. string $year Optional: year in YYYY format. Default current year.
addDay() addDay( $day = 'now', string $month = 'now', string $year = 'now') Filter by day. Parameters $day string $month Optional: month in MM numeric format. Default current month. string $year Optional: year in YYYY format. Default current year.
addPrice() addPrice(string $price) Filter by price. Parameters string $price 'free entrance', 'by donation', other strings entered as free text.