Everyone is invited to swim free from 6 to 8 tonight at the newly-renovated Walhalla Swimming Pool. The pool, which required a public-private partnership to return to working order, is getting a belated summer opening. But the attitude of those who’ve put a lot into the effort is better late than never. And they’re already thinking of a full season of swimming next year. The pool has passed muster with state health authorities, and Councilman David Underwood says lifeguards will be in place for safety purposes.