Two invitations to Isador Caplan for 'meet the artist' parties after Nippon Nogaku-dan on 18 June and Cycles and Ensembles on 20 June.
1 document
One invite has some phonecall reminders listed on the back.
Signed 'Bill' (William Servaes?)
Archive
https://www.bpacatalogue.org/archive/PG-AF-1973-6