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Re:Why Threads Are a Bad Idea (1995) [pdf] by yellowapple on Tuesday June 12, 2018 @09:19PM (#17299507)
Which includes Tk, notable for being a relatively-easy-to-use GUI toolkit that embraces events as described in these slides.

(You probably already know this; just elaborating for those who might not be familiar with Tcl/Tk)

Re:Why Threads Are a Bad Idea (1995) [pdf] by Roboprog on Wednesday June 13, 2018 @11:35PM (#17309080)
I’ve not used tcl/tk since around 2000, but it was a nice thing to quickly code up some dialog boxes for operations oriented scripts back in the day.