I first observed this species in this location on Aug 29, 2023:
https://www.inaturalist.org/observations/197566210
I saw a fairly high number of these at Hillcrest Park - the number of 12 that I’ve given is a conservative estimate. An area of this park of about .5 hectare has been designated as a wildlife biodiversity area, with signage indicating this and with the advisory “do not mow.” The area is full of Birds-foot Trefoil, the food plant of this butterfly species (see https://www.inaturalist.org/observations/229019771).