The LRI reads as follows:

If the name includes an abbreviated or full form of the year and the name is
followed by one or more additions, a year must always be included in these
111 2# $a GAGETECH '92 $d (1992 : $c Dearborn, Mich.)
111 2# $a TOOLS Europe '94 $d (1994 : $c Versailles, France)
111 2# $a AFPAC 2000 $d (2000 : $c Kiel, Germany)

I would take that to mean that if the name of the conference has an
abbreviated form of the date, one still has to use |d and the parenthetical

If the name of the conference does not have something like '91 in it, then I
would not make it part of the name but only have |d qualifier.

Gene Fieg
Claremont School of Theology
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Nancy Brown
Principal Cataloger
University of Georgia Libraries
(706) 542-0585