When somebody is organizing learning for a coordinated siyum (e.g. for a yahrzeit), I'm never sure whether as a woman I can sign up to help (assuming I can meet the expected level of learning). Are these for men only, or both men and women? Does it depend on something? If so, on what?
While, as Seth J answered, there's likely nothing wrong with it, anyone signing up to study toward a communal siyum in someone's memory should bear in mind that doing so is partially for the deceased's relatives' peace of mind and comfort. If the relatives are of the sort that would be disturbed by a woman's contributing toward the siyum, it might be better for her to avoid doing so; if she doesn't know the relatives, it may be worth asking whoever's organizing the siyum about the relatives' sensibilities and biases.
If the siyum is on mishnayos I think everyone will be delighted if a woman learns *masechta Avot (Pirkei Ovos). A woman could also pay a man to learn for the zechus of the nifter. Anything else would be risky depending on the crowd.