If people are concerned, they should try loading the chat prior to Sunday. If it loads than you know your computer can do it. If not, try playing around with the suggestions that FWC made above and see if you can load the chat thereafter.
On Sunday if you experience a problem, you can back out and try again in a few minutes. Be patient. Last time we didn't start the Q&A until almost 7:30, so just because you can't get in right at 7:00 doesn't mean you won't be able to get in in time for the bulk of the chat.
Riding shotgun on the Sox bandwagon since before there was an Internet...