Social Meeting Sites present me with this beautiful message:
"There are no more meeting occurrences to select from."
Turns out to be the masterpage I was applying.
Although everything looked perfect, custom masterpages remove additional controls available to social meeting sites, within mwsdefault.master masterpage.
Creating a customized masterpage for social meeting sites based on mwsdefault.master, solves the problem.
Thanks to Xue-Mei Chang-MSFT