[Incomplete] Best Practices: For Improving Diversity Within the Ubuntu Community

The best way to increase diversity is to communicate with new members. Community members should always look for new faces, new forum participants and people outside the FOSS spectrum. Talk to new members about their skills and interests, make suggestions to hook them up with community members of similar interests, and encourage them to attend additional events. Show new members that they are appreciated.
Keep in mind that new members show up because they're interested in Ubuntu. Interest shown to new members should center around Ubuntu, GNU/Linux, FOSS, computing, and technical information.
Follow the Ubuntu Code of Conduct Policy, Ubuntu Code of Conduct Guidelines, Ubuntu Anti-Harassment Policy, and Ubuntu Code of Conduct Dispute Resolution Procedure.
Address community members in a gender neutral way (especially if you are not sure about participant's gender) and encourage women and minorities, avoid stereotypes in presentation and materials, and never use sexist jokes. It is important that you polish your social skills towards handling diversity. We suggest that you be conversant with these articles and others at that site. Handle social faux-pas with grace and understanding, as the Ubuntu community has a wide variance in social skills.
Always be open to new opportunities for friendships and networking.

For maximum safety for everyone, schedule events at publicly accessible locations with well-lit parking areas. Attendees should only go "off-campus" from conferences in groups of 3 or more. Further locale specific safeguards should be adopted. Some other generalities that you must be aware of can be found here.