We create a simple form using your favorite form builder or Google Forms
The nominator enters the first and last name, company, and email address, picks the Activity Types they are nominating for, and enters a comment on why they are submitting.
It then creates a Member in SlapFive with a Member Status of "Nominated", and with the nominator's name and reason for nominating in the Engagement Notes, and the nominee appears in the Nominated sub-tab of the Membership screen.
Then you can review the nomination and decide how to proceed. For example, you can send them an invitation email and let them fill out a form where they pick all the Activity Types they like to do, and change their Member Status to Member.