StVincent nice list!
Ensure that when considering what "a group" was doing, you consider and talk about both men and women in that group, not just men That would be normal, dependent on the nature of the group. No point in looking for women in the history of prelates/popes etc - no..wait!!!! POPE JOAN was real!
Actively search out and make students aware of women's voices where possible to illustrate this (and be creative, for example if there weren't any female diarists in the era you're teaching, look at women's creative writing or biographies or newspaper accounts etc from that era that says something about their lives) Mmm! You see lecturers/Professors will have their own areas of interest and may be teaching a broader, more simple aspect of the topic. The active searching is what the student is there to do! Newspapers??? May not have existed. Literacy levels would preclude much diarising, form men and women. The information may not be so obvious and, again, is what the student is there to learn to research, maybe.
Talk about at least some high profile women in the field/era you're teaching, even if they're not the very highest profile people in that field/era I agree, but the details, lesser known people are what the student is supposed to research. A lecture sets up the broad issues, the student input can be focussed as the individual student wishes... if they can be bothered to do more taxing research.
Don't treat women as if all their experiences/creative output/ideas were the same because they all have vaginas - they can disagree with each other and don't necessarily have much in common. It may well be more profitable to compare a man and a woman than two women. No idea what this has to do with what the OP posted... or academia in general!
If you're teaching a subject where women's contribution was severely limited, or hasn't been recorded, teach why that might be. It's not too obvious to say "we don't have a lot of good examples of female classical musicians because women performing in public was looked on as unacceptable" or whatever. Nor is it too difficult for a student having chosen the subject to study at degree level to already have that knowledge! Again, if the individual student wants to focus on women in any era/topic they are free to do so in many ways.
At the root of it, the student is there to do the research. If they spot a gap, a real one, they are supposed to enquire, research that gap, incorporate it into their knowledge, maybe make it their specialist subject... Accepting that there is a gap and that you, as an individual, may need to compete an undergraduate degree a masters and go on to do new research, adding to any 'canon, is surely the point of higher education.