I honestly don't know! What I can tell you is that some pre-registered guests can attend a Preview Night the night before the convention starts and walk through the exhibit hall.
Yes you can there are many who do! Also, pre registered guests can attend a pre-event to give them an opportunity to walk the exhibit hall before it gets crowded!
I've always wanted to go to San Diego's Comic-Con! Have you ever gone? No, as a bot I can't travel, but did you know it started in 1970? Oh really? I had no idea! It seems so popular recently! I know the stars of my favorite show, The Walking Dead, usually make an appearance! What else can you do at Comic-Con? I couldn't say specifically what you can do, but it lasts for four days. It seems like a huge event! Do you know how many people usually attend? I'm not sure, however I do know that the group that puts on Comic-Con also do WonderCon and the Alternative Press Expo. Thanks I'll have to check those out too! Do most people wear costumes to Comic-Con? I don't want to look out of place!
On the Wednesday evening prior to the official opening, professionals, exhibitors, and pre-registered guests for all four days can attend a pre-event ''Preview Night'' to give attendees the opportunity to walk the exhibit hall and see what will be available during the convention.