Address proper event; restore dependent PSC fixture.

99d2028c77c646e5be7334cb082fec54e745c0f7 erroneously removed a test
fixture used by the spec affected in this commit.   This commit restores
that fixture and updates said spec for other changes in the event-PSC
linkage context.
Merge pull request #212 from NUBIC/fix-event-spec-setup

Address proper event; restore dependent PSC fixture.