T.L.
You have to go to the Flower Mound Pumpkin Patch this fall. I love it and its free. My son is over 2.5 and it will be the first year he will really enjoy it.
http://flowermoundpumpkinpatch.com/
Also, I think the Vista Ridge Mall does a trick or treat thing. Otherwise, find a nice and safe looking neighborhood and trick or treat there. I think trick or treaters start at about 6:30. I am never sure on the time.
Im adding http://www.parkersquare.com/eventsie.htm
Also, visit the area citys web sites such of www.cityoflewisville.com or http://www.flower-mound.com/ and look at their calander of events.
Lewisville:
Autumn Extravaganza (Halloween carnival)
Trick or Treat in doors in a safe environment at the Civic Circle Recreation Center located at 191 Civic Circle Drive, Lewisville, TX 75067 Carnival games, and face painting. Don't forget to wear your costumes so you can join in the fun during our annual Costume Contest.
http://www.flower-mound.com/parks/acitivity-programs-guid...
On a side note, it is usually to hot for most costumes here. Try to find something that you can change what they wear under it. Last year was cold but the years before that were too hot.
Have fun,
SAHM TLee