  PDS 110 is a young disk-hosting star in the Orion OB1A association. Two
dimming events of similar depth and duration were seen in 2008 (WASP) and 2011
(KELT), consistent with an object in a closed periodic orbit. In this paper we
present data from a ground-based observing campaign designed to measure the
star both photometrically and spectroscopically during the time of predicted
eclipse in September 2017. Despite high-quality photometry, the predicted
eclipse did not occur, although coherent structure is present suggesting
variable amounts of stellar flux or dust obscuration. We also searched for RV
oscillations caused by any hypothetical companion and can rule out close
binaries to 0.1 $M_\odot$. A search of Sonneberg plate archive data also
enabled us to extend the photometric baseline of this star back more than 50
years, and similarly does not re-detect any deep eclipses. Taken together, they
suggest that the eclipses seen in WASP and KELT photometry were due to
aperiodic events. It would seem that PDS 110 undergoes stochastic dimmings that
are shallower and shorter-duration than those of UX Ori variables, but may have
a similar mechanism.
