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Men Overran a Job Fair for Women in Tech
(www.wired.com)
This is a most excellent place for technology news and articles.
Companies are definitely looking for applicants there, so it would definitely be discriminatory to ban men from it. That's why it would be illegal to ban men:
"The nonprofit says it believes allyship from men is important and noted it cannot ban men from attending due to federal nondiscrimination protections in the US."