Perhaps she'll still be at a-nation, which is why the tour ends at the beginning of August, but then continue the tour in September/October for Yoyogi dates after a-nation has ended.
She could still very well miss the first few a-nation dates and be fine. Many of the artists at a-nation don't appear at every date and missing the beginning is not going to affect the DVD, meaning she would still be able to be at the recorded date. She only appeared at the Tokyo leg of a-nation 08 (?) anyway.
(Or after whatever happened last year, she bows out of future a-nation shows.)
Oh and TA are able to enter for the ticket lottery starting from January 25th at 1:00 PM.
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