Determine the name(s) of the speaker(s).
Note the month and year of the speech. If you are unable to determine the month, the year will be sufficient.
Note the title of the speech, if any.
If available, note the specific location of the speech, as well as the city and state of the location of the speech. For example: "Speech presented at MIT, Cambridge, MA." If you cannot find this information, that is alright. Your citation will not be any less reputable for not having the location of the speech.
Put all of the information you have gathered together into a single citation. The basic format for an APA style speech citation is such:
Name of speaker. (Year, Month). Title of speech (in italics). Speech presented at location of speech, City, State.