<Li> University of Massachusetts Lowell Tsongas Center, located in Lowell, Massachusetts </Li> <Li> University of Phoenix Stadium in Glendale, Arizona </Li> <Li> Wells Fargo Arena (Des Moines) which is part of Iowa Events Center in Des Moines, Iowa </Li> <Li> Wells Fargo Center is in Spectra's corporate hometown of Philadelphia . The Wells Fargo Center's predecessor, The Spectrum, is the namesake of the company . </Li>

Which of the following is not a subsidiary of the comcast - spectator organization