Philatelic Envelope - I Beates in marzo a Milano?

Side 1:
-Italian Post Office stamp, 20 Lire, tax-stamped, 1964
-Michelangelo stamp, Italian Republic 1475–1564, 1964
-Newspaper clipping with instructions on how to play a record
-Bears the annotation “Umberto Buttafava, Fermo Posta, Milan”
-Still Life drawing by Umberto Buttafava (Umberto 65)

Side 2:
-Stamp: International Eucharistic Congress, Bombay 1964, India 
Postmark: Arr. distribuzione Milano
-Bears the annotation: “Open gently,” “Crazy!!!,” “Keep”
-Beatles: Les Plus Fort, I Feel Fine, I Saw Her Standing There
-Newspaper clipping: “The Beatles in Milan in March?”