I am arriving in LAS on 11/10 and staying through 11/14. My primary reason for the visit is to attend the annual Aviation Nation Air Show at Nellis AFB.
The air show is open to the public on Saturday and Sunday and is FREE to attend. If you are in town during the weekend and want good FREE entertainment and to see some of the best the military has to offer, including the Thunderbirds, then attend the air show.
As for 11/11/11, I haven't heard of any special promotions going on for that day. Maybe some restaurant will run some special $11.11 Surf and Turf meal or something else like that.
I did send a question into the LVA question of the day, to ask about any special promotions.