In case you had any doubts, Lindy in the Park IS happening this Sunday, October 4, 2015, even with the Hardly Strictly Bluegrass festival going on. In fact, Lindy in the Park happens every Sunday, even on holidays! Always free. Every Sunday. Same place. Same time. (The only time we cancel is for rain and Bay to Breakers.)
However, parking will be more difficult, so we suggest that you plan appropriately and arrive early or take public transit.
Hope to see you Sunday!