See Chapter 49 of FAA General Order 8700.1, FAA General Aviation Inspector's Handbook at:http://www1.faa.gov/avr/afs/faa/8700/8700_vol2/2_049_00.pdf
It describes the whole process of getting a waiver to conduct an air show. The air show waiver will specify which FARs (eg 91.303(e), aerobatics below 1,500 AGL) will be waived for the duration of the air show, and yes, maximum speed can be one of them, if you ask for it. See 91.905 for the list of FARs that can be waived.
I'm sure Patty knows this stuff way better than I do.
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aboyd@igs.net ATP www.pittspecials.com