The wedding is at a restaurant, Encore By Simonis, located at Scheveningen Harbour. It is about a 20 min walk from the hotel, but it is probably easiest to get an Uber or taxi there (5 min drive).
There is a separate entrance for guests located on the side of the building, to the left of the main entrance.
For people coming by car, there are several parking options in the area.
Encore by Simonis
Dr. Lelykade 5
2583 CL Scheveningen
+31 70 3060070