As you know, the best time to head to Taiwan for teaching is around July and August when the new school term starts. If you want to teach elementary and school aged kids, then this would be the best time. But, there is usually still quite a bit of demand around November when the newly hired teachers decide to move on or leave for a number of reasons.
Really, I don't think you should be too concerned with which month you go to Taiwan. There are teaching jobs (not necessarily in the public school system) continuously being advertised all year round.
Enjoy your U2 concert!
