Prefix the location of the speech by an indication that the reference is to a speech, such as “speech to” or “paper presented to”, unless it is clear from the title of the speech. If the speech is a named lecture, give the name of the lecture instead.
For the location, give the town or city.
Eg David Baragwanath, Judge of the Court of Appeal of New Zealand “Magna Carta and the New Zealand Constitution” (speech to the English Speaking Union, Wellington, 29 June 2008).
Enclose both the location and the date in round brackets and separated by a comma.