Networking
Although membership to some groups may be restricted (e.g. some groups are for senior level executives), it is often worthwhile to check with the coordinators to see if there are upcoming events or other services that are open to non-members, or if they will let you serve as a volunteer or attend as a one-time guest.
For groups that are national in scope, the links below are to the national organizations. Look on the website to find the local chapter for the city/state/geographic area the interests you.
Association for Corporate Growth (M&A)
Consultants Network for Excellence in Non-Profits
Financial Executives International
Financial Executives Networking Group
Marketing Executives Networking Group
Society of Professional Consultants
Turnaround Management Association
If you know about organizations that are not listed here, please email the site administrator with the name of the organization and the website.