I remember a previous Accelerate said "booked and completed between x and y" (aka you cannot book until the accelerate actually starts)
but this time it only says "completed between x and y"
Number of bonus points listed above will be awarded after your Qualifying Stay at any IHG brand hotels, which must be completed between 1 September 2017 and 31 December 2017 (both dates inclusive) at InterContinental®, Crowne,....
did they change it?
some other parts can be confusing
when you purchase a qualified night Stay with your IHG® Rewards Club Credit Card between 1 September 2017 and 31 December 2017 (both dates inclusive)