Luilak (roughly "lazybones") is an old North Holland tradition held on the Saturday before Pentecost. From the early hours of the morning — sometimes as early as 4am — children and teenagers roam the streets making as much noise as possible to wake up sleepyheads, ringing doorbells, banging pots, and generally causing cheerful chaos. The tradition is strongest in Amsterdam, Haarlem, and the Zaanstreek. In Haarlem, Luilak is also the occasion for an early-morning flower and plant market along the Raamsingel. If you are a light sleeper, consider this fair warning.