Community members are invited to dare the winter and celebrate this holiday season building forts and dens out of sticks and (maybe) snow. The third pop-up adventure playground is going to be about outdoor winter frolic. It will be held at Grey Park, Main Street at Ridge Avenue, from 11 a.m. to 2 p.m. on Dec. 19.

There will be a truckload of sticks, branches, and logs, as well as other interesting stuff for folks of all ages, abilities, and interests to play and build with. Kids are welcome to experience the special excitement of vigorous winter play. Warm clothing may be required. Volunteers are welcome and may sign up at the Facebook page “Evanston Games in the Park,” where updates on date and time may be found. In case of extreme weather, the rain date will be on Dec. 20, same time, same place.