The "official First Annual Meet" by the "Bay Area & Northern California Corgis" Group will be rescheduled, according to their FB site (https://www.facebook.com/groups/bayareacorgis/).
However, on my "Corgis of Contra Costa County" site (http://www.meetup.com/Corgis-of-Contra-Costa-County-CA/) I have kept a meet-up for June 22nd, but renamed it to "SF Corgi Field trip for Contra Costa Corgis". It seems that quite a few corgis from around SF are still planning on going.
My meetup group is mainly geared towards Corgis in Contra Costa County because most of the meetups will be in CCC dog parks. However, even if you don't reside in CCC, feel free to join the group if you would like to come to meets at dog parks there.