All four performances of Lorin Maazel's Farewell concert had been sold out, when I first checked the web site of Lincoln Center for availability. But when checking again, just hitting reload every few minutes, suddenly seats became available. There was a problem with the web reservation - one could click on a seat in the chart, then it was reserved, but proceeding and actually doing the payment did not work. So I called and reserved my ticket over the phone.
The performed work was Gustav Mahler's Symphony #8, which I actually had never heard before. A great work, unusual, with chorus, also called "Symphony of 1000" because so many required performers.
A review of the concert is available from "Classical Source".