Rumor going around that a Fire Marshall is here

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The Pepsi Center is packed. The aisle on the floor behind the delegations is completely blocked by people. I can count only about 20 empty delegation seats. What happens if it's decided the bowl is over capacity?

Although the night is moving along slowly there's a constant buzz from the crowd.
You'd think something big is coming up ;)

Update from Matt: Fire Marshall's have closed convention halls in the past - most usually on Thursday night. When they close the hall, it doesn't matter what color your credential is.

Ambinder:

There are massive lines at the main guest and delegate magnetometer checkpoint at this hour. It's a widely known but little reported fact that many delegates, most guests, and nearly all donors choose to attend only the primetime hours.

10:15 ET update from PBS NewsHour Twitter: "floor access closed unless you have a seat."

10:23 ET update from PoliticsWest Twitter: "Pepsi Center closed off by fire marshall because it's too full"