During the warmer seasons this year, these have been scheduled for the first Sunday of the month. One such bazaar was already held on April 5, Easter Sunday; the next two dates are May 3 and June 7. The first Sunday of July falls during Ramadan; I don't know whether this bazaar will be rescheduled, or whether we'll simply need to wait till August.
Or whether we'll simply make do, in the interim, with the monthly bazaar at City Blessing Church, which takes place on the last Saturday of each month (previously on February 28 and March 28, next on April 25). In theory the two bazaars could fall on the same weekend, but the first possible conflict doesn't come until Saturday, October 31, and Sunday, November 1.
Masjid al-Hikmah, 48-01 31st Ave. (at 48th St.), Astoria, Queens
City Blessing Church, 38-02 61st St. (at 38th Ave.), Woodside, Queens