I missed the post that advises booking 4 months in advance, though that likely came too late for us as well:
Any hope for Corrie Ten Boom Museum in Haarlem?
We're a family of 5 staying in Harlem 6/12-6/15. Rick Steves Best of Europe said "book at least 10 days in advance." I'm thinking I'm good, this is is not an extreme situation. I've got Uffizi and Accademia booked and plans to book Eiffel Tower tickets when they're released and an alarm set to be up at 1am to book Anne Frank's House. I go over to book Corrie Ten Boom, and they're booked 4 MONTHS out for an English tour! (And strongly forbid booking another language tour.) I completed the reservation form since there was 1 opening 2 of the days we're in the Netherlands, but no response a day later and now the calendar shows full those days.
Is there any hope? Is there anything we can do? Any tips? TIA!