If that is one of your goals, you are actively working against it.
A suggestion for next time:
Put a call out for “experienced VR developers” at X location. State that you are trying to put together a diverse panel (age, sex, race, etc). Do not specifically ask for applications from only one demographic. Then go about arranging your panel behind closed doors, you can select for whatever ratios you want.
As it is, you have just created a negative image of the event (for men and women alike). Many people would find it unpleasant to attend or speak at an event where they knew explicit quotas created the line up. This goes just as much for female developers, as feeling like you attained an opportunity because of factors besides your skill and value to the audience can foster “imposter syndrome”. So what I’m saying is: feel free to manipulate the speaker demographics for whatever social effect you are looking for, but avoid publicising your manipulation if you want it to be effective.