You must have been taking a bathroom break. They played the "1812 Overture" last night, as they have every previous year. It's one of the highlights of the evening for me! Now, I don't know what network you were watching; we saw it on Boston's ABC affiliate, WCVB.
Actually, we didn't see a live performance, because the concert had to be suspended, and the Esplanade evacuated because of an impending thunderstorm. The network broadcast, instead, the previous evening's dress rehearsal, but it included choir, guns, and chimes!
I watched it on CBS and I have no idea if it was the local station or the network but I just caught the cannons firing. I had missed everything up to that.
The local station must have aired the entire concert. CBS had the national broadcast...it was only one hour..the 1812 overture was not seen. It may have been due to the weather..I was not aware that the concert had been delayed.