  We construct a deformed $SO/Sp$ Penner generating function responsible for
the close connection between $SO/Sp$ Chern-Simons gauge theories at large $N$
and the $SO/Sp$ Penner models. This construction is then shown to follow from a
sector of a Chern-Simons gauge theory with coupling constant $\lambda$. The
free energy and its continuum limit of the perturbative Chern-Simons gauge
theory are obtained from the Penner model. Finally, asymptotic expansions for
the logarithm of the gauge group volumes are given for every genus $g\geq 0$
and shown to be equivalent to the continuum limits of the $SO/Sp$ Chern-Simons
gauge theories and the $SO/Sp$ Penner models
