Pnags05, welcome to the forum! I'm in the Mid-Cities area, but haven't done much in the way of poker runs and charity rides. You can often find information at the dealerships. Some of the local shops like Bikers Bay or Cycle Gear will also have information available on the rides. Probably the biggest in the area is the Big Texas Toy Run in December.
My wife and I have a number of routes around Grapevine to take rides that are a couple of hours long. A couple of places like are the road over the Grapevine dam. Just north of the dam, there are 3 roundabouts that can be fun to ride around. Also try Dove Loop Road out through Southlake to Keller. It's slow, but fairly pretty. Another area to try is Hwy 377 north from 114 to FM 407, then west to Justin, and on to US 287. Just watch your speed through Northlake and Justin. 377 north of Denton up to Gainesville is also a nice ride.
Some other roads to consider are FM 51 north out of Decatur, which goes up through the LBJ National Grasslands. If you just want to burn some highway miles, try 287 north from Ft. Worth up to Wichita Falls.
If you're looking for a good all-day ride, try going west out of Ft Worth to Weatherford, then take 81 through Mineral Wells out to Palo Pinto, then take Hwy 4 down to Granbury. The best section on FM 4 is actually between Palo Pinto and I-20, which has lots of twisties.
One website that helped me find some good roads in the area is
www.motorcycleroads.us
Don't be afraid to try some of the smaller country roads; you can really find some wonderful little roads both north and west of town. East Texas has some good riding also, you just have to deal with a lot of the mess that is Dallas traffic to get there.