Captain Nils U. Ridstrom of Alvsnabben

[marie]

In 1966 The Alvsnabben visit Puerto Rico and the Captain was honor by the Mayor of San Juan with a special Reception. By that time My grandfather Erik Gerhard Berg was living in Puerto Rico and received a special invitation of captain Ridstrom  
to accompany him to this reception.
Is there anyone who was part of the crew member of this ship or family of the Captain who have any recollection of this event. Please contact me