"Glitz" is bright lights, sparkles, bold colors, flashing neon and glitter. It is less subtle and more showy than "glamour." Have you ever seen film footage of the Las Vegas strip? That's glitz.
In recent years, people have started using the word "proactive" as an antonym of "reactive." Your definition is correct; it is intended to mean forseeing a situation and handling it before it occurs. "Anticipate" could easily be used instead, but it doesn't have that important, corporate boardroom ring to it like "proactive" does.
Yes, as Ouisch said proactive is the opposite of reactive. With proactive you make things happen rather than wait for them to happen. you take an active, aggressive role to comply with the spirit of our modern age (a new business principle: proactive approach): This is a proactive approach to staffing requirements. You must always be prepared for the unexpected, used usually in a business context.
Create a proactive cultural awareness of risk at corporate and individual level.