Well, we just posted our annual listing of NYC Free Summer Shows. It's definitely one of our most popular articles each year. Right now it's a bit more sparse but there will definitely be more shows announced. Also, PS1 is not on the list because there is a set fee. In the past they asked for a donation.
Speaking of free shows in New York, check out the ticket giveaways we have running on Prefix Events NYC:
Stay tuned for even more ticket giveaways!