Here are some ideas that are focused on promoting openness and intellectual courage on campuses.
Visiting Speakers
Consider two speakers: Instead of inviting a speaker to talk about their work, invite a speaker to discuss their work with someone who takes a different approach or who has a different view.
Provide opportunities for career development: Invite students to talk to speakers about their own interests and aspirations. This is not only useful to students, it also humanizes the speakers and helps students develop more context for understanding a speaker's view.
Shorter is better: Encourage speakers to talk for around 30 minutes, so that students and/or a respondent have plenty of time to engage with their arguments.
Anonymous Questions: If possible, consider giving students the opportunity to submit questions in advance.
Campus Clubs
Encourage Adversarial Collaboration: Invite student organizations to engage with groups on campus who disagree with them, and even to cosponsor events with people who they disagree with!