Personal communications may be private letters, memos, non-archived electronic communications, personal interviews, etc. Because they do not provide recoverable data, they are not included in the reference list. The same is true of live performances.
Instead, you should cite these sources in your text with initial and last name of the communicator and as exact a date as possible.
M. E. Daniels, Jr. (personal communication, July 4, 2009), explained in an email that . . .
(Butler Ballet, performance, December 13, 2008)
If you are citing a recording or archived copy of the performance or personal communication, these forms are recoverable and should be referenced in your Works Cited list as a video, online forum post, tape recording, etc.