Here is a post regarding the time of the Forum Rally next January from another string.
"The next Quartzsite RV Show will be January 19 - 27, 2019 and many of us will be camped south of town at the La Posa West area we generally call 541 which is the number of the dirt road leading into our site. You're always welcome to join us and it's a wonderful way to meet RV Forum members. It's fun to put faces to the names you've been seeing!"
A later post corrected the location to La Posa Tyson Wash.