For conferences, the rule is the same. Qualifiers in the heading and in the ‡c of the additions will use the name in effect during the time of the conference. The following headings are both valid:

Vsesoiuznaia konferentsiia "Kniga v Rossii do serediny XIX v." (3rd : 1985 : Leningrad, R.S.F.S.R.)

International Conference LPAR '92 (1992 : Saint Petersburg, Russia)