H.O.T. Oldtimertreffen, formerly known as the Hirschberger Oldtimertreffen, is an independent gathering for people who enjoy classic, vintage, and distinctive vehicles. Running since 2005, the event welcomes oldtimers and youngtimers regardless of make, model year, or club membership. Visitors can arrive and leave at their convenience and bring along whoever or whatever they choose, creating an informal, inclusive space for sharing an interest in vehicles of many ages and conditions.

The H.O.T. website serves as a hub for information about past and upcoming gatherings. It features event dates, practical details such as directions, and photo, text, and video recaps. Visitors can also browse an archive of previous meetings, vehicle-related posts, parts, and points of interest. The site highlights other motoring events and places, including tractor gatherings, museums, and automotive exhibitions, and shares travel reports, stories, and videos. H.O.T. also maintains a presence on Facebook and Instagram. Its organizers announce updates and changes to event arrangements through the website, helping attendees stay informed and connected.