This question arose from reading Jacob Lurie's "Classification of topological field theories" paper. In that paper, he uses complete $n$-fold Segal spaces as a model for $(\infty,n)$-categories, but he "glosses over" the question what a \emph{symmetric monoidal} symmetric monoidal $(\infty,n)$-category is (a notion that is central for the whole theory). So here is the question:
''What structure on an $n$-fold complete Segal space does turn it into a symmetric monoidal $(\infty,n)$-category? (or: where can I read about it?)''
What structure on an $n$-fold complete Segal space does turn it into a symmetric monoidal $(\infty,n)$-category, and where can I read about it?
