I am fascinated by the stadium disaster in Fidanae in 27 AD (basically a poorly constructed wooden coliseum had been built quickly for gladiator games; 50,000 people filled the stands, and they collapsed, killed 20,000 people).
As near as I can tell we know of the disaster from two sources: Tacitus: http://en.wikisource.org/wiki/The_Annals_(Tacitus)/Book_4#62 and Tranquillus: http://en.wikisource.org/wiki/The_Lives_of_the_Twelve_Caesars/Tiberius#40
Are these the only sources talking about this disaster? It's clearly one of the very largest human disasters in the history of mankind; it just seems weird that all we know about it is from these two very short sources.
Are there modern books that explore either this disaster, or construction techniques at the time showing how they may have built this stadium?
This disaster has always resonated with me for the seemingly modern response; basically they instituted regulations to prevent similar constructions, and set financial standards for who would be allowed to build stadiums in the future.
Suetonius is the more common name for your second source. I know Romans have tons of names and it can get confusing as to which one to use, especially since some (Cassius Dio, Dio Cassius, whatever) don't have an agreed usage.
Brill's New Pauly lists only Tac. Ann. 4,63 and Suet. Tib. 40 as sources for that collapse, and that's not surprising. For that period after Tacitus we have to wait for Dio, and Dio doesn't seemed to have cared (I did a quick search for anything in Dio for you; nothing stuck out). Pauly does give some bibliography:
A. M. Betti Sestieri, F., in: Archeologia Laziale 10, 1990, 115-120. Nissen 2, 604ff. G. Garbugino, s.v. F., EV 2, 509 L. Quilici,S. Quilici Gigli, F., 1986.
I also found after a quick google search references to this collapse in engineering papers, which I don't understand and I don't know how to evaluate. I'm sure you can turn them up easily enough if you want to dig through them.