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We are planning a trip about August 21 which is too late for this promotion. Please post as soon as you know the next one. Thanks

We always do post as soon as we know. But sometimes we don't know until just about the start date of the promo.

And while sometimes Choice runs promos back to back with zero gap, it's much more common for them to have at least a week if not a few weeks between one promo and the next. So since the current promo ends on the 15th (check-in date), unfortunately the 21st sounds early for the next promo (unless they do them back-to-back).