Beginning Mountain Biking (산악자전거) Ride in September

Official Ride information has been posted  최근 산행 안내 forum.  Please reply on that forum if you plan to attend.  Ride date has been set for September 20th.
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Per request from some of BAC members, I would like to set up a beginning mountain biking class/ride in the month of September.  I am trying to avoid overlapping any BAC planned hiking dates, i.e. TRT on 9/12-9/14, and my previously committed dates.  It looks like either 9/6 or 9/20 works.  Can you let me know which date is preferred?  Once I have the date set, I will repost this in the right forum.

Meeting place:  Parking lot of Arastradero Preserve, 1530 Arastradero Rd, Palo Alto
Meeting time:  8:30am
Ride duration:  5 - 6 miles, should take 2 to 3 hours

Directions: 
From North of Palo Alto
Take 280 South
Exit Page Mill Rd.
Turn Right at exit to stay on Page Mill Rd.
Turn Right at 1st road, Arastradero Rd.
Parking lot will be on the right side about 1/2 mile

From South of Palo Alto
Take 280 North
Exit Page Mill Rd.  There are 2 lanes on the exit, Stay on the left one.
Turn Left onto Page Mill Rd. heading to the mountains.
Pass the 1st stop sign.
Turn right at Arastradero Rd.
1/2 mile down will be the parking lot on the right side.

Mandatory requirements for the ride is as follows:

• mountain bike
• helmet (required by law otherwise can be ticketed by rangers)
  

Other than above, you should bring:

• water
• light snack (i.e. energy bar, energy gel) - no lunch required
• sunglasses
• riding gloves - not required but ideal to ride with it
  
• spare tube - not required but should always carry one
• other minor items, I will be carrying them, so not needed for this time