How do you plan for Sinterklaas + Koningsdag + Christmas peak in NL?

NL retail has three peak moments, not one, and most non-Dutch developers miss two of them. Sinterklaas (Dec 5): the Dutch national gifting day, bigger than Christmas in toys, gifts, and chocolate categories. Surge starts ~Nov 20, peaks Dec 3-5. Koningsdag (Apr 27): King’s Day, the orange-themed retail spike, huge for fashion, beverages, party supplies. Black Friday (Nov): adopted late in NL but now huge. Christmas (Dec): secondary peak after Sinterklaas. Plus minor peaks: Liberation Day (May 5), tulip season (Mar, May for flower/gift DTC), summer vacation slowdown (Jul, Aug). Our war-room recipe: (1) synthetic load test at 35× baseline two weeks pre-peak (Sinterklaas + Black Friday compounded); (2) Redis cluster + Varnish FPC with smart-purge; (3) queue-isolated checkout on its own PHP-FPM pool; (4) Adyen tokenisation for repeat buyers; (5) iDEAL bank-redirect fallback chains when ABN/ING/Rabobank apps spike; (6) Cloudflare or Fastly in front for static + image.