Whenever possible, use a gender neutral language and avoid using gender-biased words and phrases.
For example, instead of "Chairman," you can try "Chair," "Moderator," or "Facilitator." But if the gender of the "Chair" is obvious from the context, then you can use "Chairman" or "Chairwoman" as appropriate.
Here are some other suggestions (inspired by Microsoft Style Guide):
OLD USAGE: Man. Mankind. TRY: Humanity. People. Humankind.
OLD USAGE: "He mans the boat." TRY: "He operates the boat."
OLD USAGE: "The candidate was manhandled on the campaign trail." TRY: "The candidate was roughed up on the campaign trail."
OLD USAGE: Salesman. TRY: Sales Representative. Sales Person.
OLD USAGE: Man-made. TRY: Synthetic. Manufactured.
OLD USAGE: Manpower. TRY: Workforce. Staff. Personnel.