I think you should revisit your definition of discrimination. Discrimination is treating someone unfavorably or with prejudice due to their gender. This event is for female founders and promoting them. There is nothing against men, against male founders, or the sex in general.
Just because something is for one subject does not mean it's against the opposite.
Definitions of words are a) subjective b) tools for communication and c) political. I think my definition of discrimination is better, because there's no objective definition of 'good discrimination' versus 'bad discrimination'. Defining discrimination to only mean 'bad discrimination' is then futile, and doesn't really help with communication. In fact, those endless debates of what is and what is not discrimination would be replaced with slightly more constructive debates of where discrimination might be justified and where not.
Just because something is for one subject does not mean it's against the opposite.