A professional, as the definition goes, is

a) a person following a profession, especially a learned profession,
b) one who earns a living in a given or implied occupation,
c) a skilled practitioner an expert.

In a more restrictive sense, profession often refers specifically to fields that require extensive study and mastery of specialized knowledge such as law, medicine, the military, nursing, the clergy or engineering. In this sense, profession is contrasted with occupation, which refers generally to the nature of a person's employment.

For 6PC, which was set up for 'gay professionals', it is sufficient that you are interested in networking, in actively participating in the community.

If you are interested in us, we are interested in you.

You do not need to have a degree or prove you are a successful 'professional'.