No luck. I emailed them and this is exactly what I was told:
"Due to technical difficulties please try again – the invitation states EST however the Event is scheduled PST."
My reply: "Yes I thought so too, but unfortunately I am still not able to access it. I will give it another day and let you know. "
Their second reply: "Yes please do. I appreciate your communication with this. Also, try clearing your Cache too, under your history tab just to be sure."
Tried clearing the cache- didn't work.
Tried using safari on my ipad rather than chrome on my laptop - didn't work.
Next guess- maybe it is 21st rather than 20th?
Final guess- maybe it is 12:00 AM PST on the 21st... will keep you updated!