From Fri-9/28 at 10am To Sat-9/29 at 10pm is the 2nd annual..
Mogollon Monster 100 Mile Trail Run.. http://www.mogollonmonster100.com/
This actual 106 mile trails/roads run begins on 9/28am at the Pine, AZ TH (south of Pine off Hwy 87) and continues from this Pine TH up to the Rim Top and then runs on some parts of FR300 (one being a 4.5mile section of FR300 between the General Spring Cabin area to the south end start of the Houston Brothers Trail). This 100 mile run, two day event, also includes most all of the Cabin Loop Trails and also below the Rim on a number of other popular trails.
I'm not sure how many qualified 100 mile trail runners register for something like this, but I read somewhere that maybe a maximum of 100 to 150 runners could be accepted for registration. A pretty big deal with a lot of planning and logistics required.. see this above well organized and detailed website link for more info..
Between active "Elk Hunting Season" open on the Mogollon Rim, the beginning of "Mogollon Rim Autumn Colors", and this "Mogollon Monster 100 Mile Trail Run", be aware of a lot of activity this late September'12 weekend if planning a hiking/camping trip in this area