In October 1987, the first Giant hot periods since 1955 were observed. They started about six weeks after the 1987 Sep 12 eruption. More hot periods were observed in the spring, with the next eruption of Giant on 1988 Jun 28.
More hot periods were observed in late July, just as the fire activity in the park started to pick up. By late August 1988, Giant was having hot periods almost daily. All of us had no idea what to look for or what was the progression of events leading up to an eruption. Notice the confusion over which vents are which, and what they should be called. Also notice also how excited we could get over what we now know are pretty minor hot periods.
As it turned out, there wasn't much chance of observing Giant due to the fire activity, and the evacuation of the Old Faithful area. Giant did erupt just a week after the last hot period on this video, on 1988 Sep 12.