We’re guessing that the mentioned park is the Wildwood Park that eventually became Meydenbauer Beach Park in Bellevue. It was a site for various picnics over the years. There was an Irish one in August, 1919 and here’s a photo from 1914 that has a banner for a Socialist picnic (the latter photo from Paul Dorpat’s look at some Lake Washington crossings that existed prior to the 520 floating bridge).
July 22nd, 1919
May 28th, 1937
August 21st, 1971
You can listen to some of Vladimir Ussachevsky’s pieces on youtube.
April 26th, 1966
February 7th, 1935
November 14th, 1919
May 2nd, 1931
February 15th, 1900
May 7th, 1933
May 14th, 1953
February 4th, 1905



