Final answer:
Using a retreat or unique venue for participants can expand outreach, promote diversity, and be cost-effective.
Step-by-step explanation:
Using a retreat or unique venue for participants can provide several benefits. Firstly, it can expand the outreach of the event by marketing to multiple networks, allowing for a wider audience. Secondly, it promotes diversity among attendees, creating a more inclusive and representative environment. Lastly, using combined resources can often be more cost-effective, as it allows for shared expenses and increased purchasing power.