Hello from the IB board, and apologies in advance if this is the wrong thread to ask this question.

I'm flying BER-AMS on Tuesday 11th, I bought my OW ticket quite early at for less than 100eur but I noticed the prices for all KL BER-AMS flights that day are now 737eur, which is the highest for OW in July. Is there anything special going on that day? A return departing July 11 can be had for 2xx, who would pay the OW price? Thank you for reading!