Kids are welcome at the rehearsal dinner, but the wedding and reception are adults only.
The best way is to catch an Uber or Lyft. As long as you're staying in downtown Dallas, the ride should take no longer than 10 minutes and cost $7 - $10.
The official dress code is black tie optional. For ladies, this means wearing anything from a full-length gown to a formal cocktail dress - whatever you feel most comfortable in! I would advise avoiding stiletto heels as the party will take place in an outdoor garden with lots of grass, but block heels or wedges should be just fine. For guys, opt for a dark suit or a tuxedo if you're feeling extra fancy.
The best place to park is in the Trammel Crow Parking lot right in front of the Nasher. 1771 N Olive St Dallas, TX 75201, US Parking on the weekends is a flat $5 fee.