Yes, a photo permit is required. According to their website, professional wedding or engagement photoshoots, using your photographer, can be booked in 90-minute blocks in the Park. Wedding photoshoots inside the Museum are only available if you have booked your wedding with Aga Khan. In 2021, the cost was $425 for Saturday and Sunday and $325 Monday to Friday. For an updated quote, contact private.events@agakhanmuseum.org. Source: Aga Khan Museum