National HDT Rally 2022 National HDT Rally To see information, presentations, and pictures from past rallies, visit... 2021 HDT Rally Seminar Abstracts 2021 HDT Rally Schedule of Events HDTRally.com REGISTER HDT Rally Miscellaneous Photos Video of the 2020 National HDT Rally The National HDT Rally is from October 9 to 15, 2022. This year you will be able to register online. The rally includes a number of new seminars, and with growth we’ve rented additional space. At times, there will be more than one event taking place simultaneously.