[quote=@rush99999]
<Snipped quote by Guardian Angel Haruki>

I'm not saying we long rest in the Hall of Illusions. I'm saying we return to our respective lodgings for some much needed shut eye after eight hours of revelry and then head through the portal when we're all rested up. I see no reason why we have to go in right this instant.
[/quote]

That would still be a 'No'.

As to why: You were told that this past night was going to be their last night at this particular site (heck, probably even in the Material Plane). So, they are going to be packing up this morning and heading out.

There's also [I][Redacted. Sorry, no spoilers!][/I] 

So, it really is now or never.