BLOGS AND ONLINE COMMUNITIES
The National Investment Banking Association represents 26 years of experience as a not-for-profit trade association of national, regional and independent broker dealers, investment banking firms, investment advisors, and related capital market service providers.
There are a multitude of investment banking evens around the world, and most are focused on a specific industry segment. You would be wise to do a Google search in your area of specialization.
You can also visit these websites for a comprehensive annual calendar of events:
Credit Suisse Conference calendar
You might also check out:
All Conferences.com has good search and browse capabilities for trade shows and conferences, commercial and academic.