We are big advocates of round table style events where peer groups get to have an intimate and confidential discussion on topics important to them. It's like gettting a university degree in a day and the relationship building is hard to match with other types of events. Sure the cost-per-lead may be higher than other engagement channels (although you can avoid the high-sticker-fees of event management companies), but you aren't just getting a lead and participants aren't just being sold to.