There is a variety of GT series you can marshal depending on where you live in the world. In Australia they have a fantastic series called the Australian GT with an incredible 12 hours of Bathurst run every year on the world famous Mount Panorama circuit. In Europe there is the Blancpain GT series which consists of the Blancpain Endurance Series (BEC) and the Blancpain Sprint Series (BSS). The most famous BEC event is probably the 24 hours of Spa on the world famous Spa-Francochamps Circuit. In Germany VLN series are very popular as they race on the famous Nurburgring Circuit. With their most famous race being the ADAC 24 hours of Nurburgring on the legendary Nordschleife Circuit. There are the 24h series which take place around the world, most notably the Dubai 24h at the Dubai Autodrome. And there are independent one off events featuring the same GT technology run annually at the Yas Marina Circut as Gulf 12 hour. In the US however the most notable GT series racing takes place under the SCCA-Pro Pirelli World Challenge moniker.
To volunteer as a marshal for an SCCA-PRO World Challenge event there may be a specific role that could get you accepted to any race they put on. As far as I know however, to be a flag or track marshal, each event is responsible for their own marshals. Since the majority of World Challenge races take place as a support series for a larger event including IndyCar and United SportsCar Series in the US or Canada, few clubs handle all marshal recruitment.
So how do you go about registering?
There are a few options however you will have to do some research. The most obvious option is to contact the event organizer. Typically, events like Toronto Indy publish a web site: hondaindytoronto.com The web site is frequently advertised by local news outlets and anyone can theoretically register. There is obviously no guarantee of being accepted. Be careful not to sign up for a volunteering role that doesn’t involve marshaling. For example a lot of volunteers are used for everything from crowd control/security to garbage collection.
The other option is to become a member of a marshaling club or organization. You would think that being a member of the SCCA makes you a prime candidate for their Pro-Racing Series, you’d be wrong. The series is run as a business and I’m sure many non-SCCA marshals work their events. But generally speaking being a part of USAC or SCCA allows you to get the necessary training to qualify as a pro-event marshal. So that when registration opens, and a particular organization is selected to provide marshals for that event, you will be more likely to be accepted as a member of that club.
The final option is to contact the circuit where the event takes place. For example when I wanted to marshal MotoGP, the only contacts I could find were employed by Indianapolis Motor Speedway. So it was an obvious choice of first contact (this was before I learned of USAC). You may go as far as asking for a job with the circuit so that when the big event comes around you have the possibility of working there as an employee. This is the case with many New Jersey Motorsport Park marshals who were specifically employed by the track to work various track rental days, and who were also given an opportunity to work major events when the majority of marshals there are volunteers. Working for the track is not practical if you only want to volunteer weekends. Similarly, many street circuits are only assembled for a particular event.
Best of luck and if you have pertinent information to share, please leave a comment below!