I was thinking it would be in August. It looks like the FDA wants to push things forward faster than expected. Which is not surprising given the extent of the opioid crisis and the new FDA commissioner's efforts on this front.
This date is not listed on FDA website, has not been PR'ed by IPCI, and is not being carried by any other news site other than the one linked above. Not impossible but would be unusual for FDA to convene an AdComm less than 1 month after announcing it.