Knowing the differences between your male and female audience is extremely important in successful public speaking today
My first piece of advice is to relax and enjoy it. With a doubt, a female audience is much easier to address than an all-male audience. Business women are quicker to voice their approval and to express laughter. And, it is their response to your words or your message that can boost your confidence and make your presentation that much easier and fun to deliver.
What is fascinating about speaking to women is that you can become much more personal with them in your talk than you can with an all-male audience; and, there are not many subjects you cannot cover with a female audience. [Incidentally, an audience in which the majority in attendance are female is considered a female audience. While men are slower to laugh than women, if enough female voices are raised in laughter then the men will join in.]