While I admire honoring a traditional usage, the modern highway overpasses are more structurally suitable for the suggested public entertainment.
Pock-marked walls remain unsurpassed, when circumstances permit.
One must remember that the Producers and sometimes the audience members of these fine shows are often nominated as the dramatic actors in the sequels. The series may run longer than expected.
Avoid crowds.
They could truck a couple of small sections to just outside the UN, CDC and NIH Hq's along with some outside the capitol and congressional/senate buildings. There's just so many uses for them, all sorely needed.