As announced on their Facebook and website, the big comic convention in Seattle has been postponed.

From their website:

Each year the Emerald City Comic Con team works their hardest to do right by the thousands of fans that come together in Seattle. We want to create a space for you to gather, be yourselves and make memories with those who matter to you most. We have been closely monitoring the situation around the COVID-19 virus in Seattle, and, after many hours of conversation internally and consultation with local government officials and the tourism bureau, we have decided to move next week’s Emerald City Comic Con to Summer 2020 with date and detail announcement forthcoming. We did everything that we could to run the event as planned, but ultimately, we are following the guidance of the local public health officials indicating that conventions should now be postponed.

It goes on to say that they're refunding all tickets, but because of how many they need to refund you may not see the return for upto 30 days.

Get more info on their website including how to get your ticket refunded.