Thought this would be a fun idea.
On October 27th:
1901: The first full performance of Debussy's Nocturnes premieres under Camille Chevillard with the Lamoureux Orchestra
1950: Paul Creston's 3rd Symphony premieres
I'll leave October 28th to fellow members who are currently living in that day.
101 years ago, Strauss conducted the first performance of Eine Alpensinfonie (28/10/1915)