That looks very similar to my list. I would start the bio earlier (Aug/Sept) -- the first writer of choice might decline (I've had that happen) and when you do get someone to write it, they may not be very timely. I also don't start looking for airplane tickets in July for January flights. 6 months out is unlikely to be any cheaper than 1 to 2 months out, and you won't hear of any sales that far in advance.

Two additional things for your list:
- Arrange for ConFusion to pick up the tab for the GoH's meals.
- If the GoH need to be reimbursed for anything, stay in touch with the GoH and the Treasurer to ensure that it gets done in a timely fashion.