In reply to Rory.

That's not poor ticket sales at all! Thats like 85% of the venue sold! She made $4 million from selling 33,000 tickets the first few days the venue went on sale. Which means she probably made an additional $2 million from 50,000 tickets sold.
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The show was postponed due to interior construction. The venue was was still willing to allow the concert to take place but Bey wasn't having it.