Weather: nineties during the day, about seventy at night: no jacket required.

Events: there are many websites listing this: google "Las Vegas events September 2018."

Will you have a car?

If so, consider eating off strip: again, google up info on where to go via trip advisor, yelp or similar sites.

The strip is unique as far as a place to view and experience excess in all of its forms, but it can be expensive if you do more than just eyeball.

I second eating at least one meal at In 'n Out: best fast food hamburger joint I've been to (Double double, gorilla style, fries, vanilla shake).

There are interesting things to see off strip, including the Atomic Testing Museum and for the adventuresome there is what is reported to be a great zipline near Boulder City called Bootleg Canyon Zipline,

see