Once you arrive at Frederik Meijer Gardens and Sculpture Park, follow the signs to "event parking"-- spaces will be reserved despite the concert on site.
The best route from the church to Frederik Meijer Gardens and Sculpture Park is to get on I-96 at Fruit Ridge and exit at Leonard and turn left onto Leonard St (This is the last open exit under current construction). You will then turn south onto the East Beltline and take the second "michigan left turn-around" which will take you straight into the entrance of Frederik Meijer Gardens and Sculpture Park.
The wedding attire is semi-formal.