Breaking up venue into 2 rooms

We're getting married in a museum, and there are 2 medium sized rooms. One is cool, the other is very ugly. (Lime green painted classroom). In order to fit everyone we want (200 or more), we may need to use both rooms. They're connected by a foyer/large open hallway. I don't want to separate the guests or make anyone feel like the "B-crowd" because they're not in the same room with the bride & groom. I also don't want anyone to miss toasts/first dances/etc. Does anyone have any creative ideas for how to utilize these rooms? We've already done a LOT of cutting down of the guest list. Any ideas to make the best use of the 2 separated spaces without a weird divide, make sure everyone enjoys themselves, and also make sure we can invite the number we want (I want to be able to invite my friends IN ADDITION TO our required giant families)?