Super great questions! Here's some clarity on those hours.
Yes @Rares, early access for our VIP Sponsors will be offered all fours days of the convention. I think the omission of Thursday was just due to some old copy being used in drafting the descriptions. (Thank you for being a Sponsor!) We're looking into communicating this a bit more clearly so everyone is on the same page between now and the Con.
And yes @Groovy_Stallion, the Marketplace WILL be open before we officially launch our weekend-long party!