I was driving the Z to work this morning and witnessed this spectacle. The California Mille.
1957 Alfa Romeo Giulietta Sprint Lt. Wt, Alamo, CA
1952 Tojeiro Roadster, Phoenix, AZ
1959 Porsche 356A coupe, Pacific Palisades, CA
1957 Alfa Romeo Sprint Veloce, Berkeley, CA
1957 Volvo P544, Beverly Hills, CA
1956 Alfa Romeo 1900CSS, Los Angeles, CA
1955 Porsche Speedster, Stuart, FL
1958 AC Aceca Coupe, Armonk, NY
1928 Bentley 4.5 Vanden Plas, Burford Oxon, UK
1956 Jaguar XK140MC, Phoenix, AZ
1927 Bentley 6.5 LeMans, Pebble Beach, CA
1953 Siata 208S, San Francisco, CA
1958 Arnolt Bristol Bolide, Newark, CT
1956 Austin-Healey 100M, Pound Ridge, NY
1962 Porsche Roadster, La Jolla, CA
1960 Alfa Romeo Giulia Spider, San Francisco, CA
1958 Porsche Speedster, Buellton, CA
1957 AC Ace Bristol Zagat, Portland, OR
1961 Mercedes-Benz 300SL roadster, Redding, CA
1957 Alfa Romeo Spring Speciale, San Francisco, CA
1954 Jaguar XK120 dhc, Hailey, ID
1959 Ferrari 250GT PF Coupe, Pasadena, CA
1959 Porsche 356 Convertible D, Encinitas, CA
1953 Porsche 356A cabriolet, Burbank, CA
1962 Alfa Romeo Giulia Spider, San Rafael, CA
1962 Mercedes-Benz 300SL roadster, Encino, CA
1957 Ferrari PF Cabriolet Series 1, Chicago, IL
1939 Jaguar SS100, Tokyo, Japan
1957 Corvette, Carmel Valley, CA
1954 Jaguar XK120 ots, Hamilton, MA
1957 Ferrari 250TDF, Westlake Village, CA
1953 Nash-Healey Series II roadster, Zephyr Cove, NY
1949 Healey Silverstone, Tokyo, Japan
1959 Aston Martin DB2/4 Mk3, Greensburg, PA
1951 Allard K-2, Scottsdale, AZ
1959 Porsche 356 Convertible D, Glydon, MA
1956 Ferrari 250GT Boano coupe, Hinsdale,IL
1957 Porsche Speedster, Victoria, BC
1957 Porsche Speedster, Thousand Oaks, CA
1957 Lotus Elite, Auburn, CA
1957 AC Aceca Coupe, Torrance, CA
1957 Porsche 356 Coupe, Beverly Hills, CA
1954 Lancia Aurelia B20, Beverly Hills, CA
1955 Porsche 550 Spyder, Warren, VT
1959 Ferrari 250GT Cabriolet, Kearney, NE
1957 Lancia B24, Laguna Beach, CA
1957 Mercedes-Benz 300SL roadster, Los Angeles, CA
1952 Jaguar XK120 fhc, Hailey, ID
1957 Alfa Romeo Giulietta Spider Veloce, Brentwood, CA
1953 Morgan +4, Mill Valley, CA
1957 Kurtis Kraft 500KK, Calgary,Alberta
1956 Alfa Romeo Giulietta Spider, Los Angeles, CA
1954 Nash-Healey coupe, Inglewood, CA
1957 Jaguar XK140 dhc, Mill Valley, CA
1929 Bentley 4.5 Supercharged, North Kingstown, RI
1958 Ferrari 250GT Cabriolet, Los Angeles, CA
1957 Mercedes-Benz 300SL roadster, Encino, CA
1961 Mercedes-Benz 300SL roadster, Palm Springs, CA
1957 Alfa Romeo Giulietta Spider Veloce, London, UK
1958 Ferrari 250TDF, Westlake Village, CA
1957 Porsche 356 GT, Newport Beach, CA
1938 Lancia Aprili, Rowayton, CT
1957 Alfa Romeo Giulietta Sprint, Hallansdale Beach, FL
1953 Alfa Romeo 1900 Pininfarina, Woodside, CA
1957 Ford Thunderbird, Santa Barbara, CA
1960 Mercedes-Benz 300SL roadster, Santa Barbara, CA
1957 Alfa Romeo Giulietta Spider Veloce, Bogota, Colombia
1960 Alfa Romeo Giulietta Spider Veloce, Pinole, CA
1955 Lancia Aurelia B20S GT, San Rafael, CA
1957 AC Ace Bristol, Kingsburg, CA
1957 Porsche 356A coupe, St. Louis, MO
1958 Ferrari 250TR, New York, NY
1955 Mercedes-Benz 300SL gullwing, Malibu, CA
1957 Lancia Aurelia B24S, San Francisco, CA
1962 Lancia Appia Zagato, Newport Beach, CA
California Mille: Press Releases
I gave them the thumbs up but most did not respond. I've concluded most of them own 350Z's.