Every year, Dutch supergroup De Toppers take over the 68,000-capacity Amsterdam Arena for a string of sold-out shows billed as “the sing-along party of the year.” As usual, the 2018 “Pretty in Pink – The Circus Edition” concerts were among Holland’s hottest tickets so far this year, and it was a substantial Adamson E-Series system from Ampco Flaslight Rental that brought the hits to the capacity crowd.