Frustrated with the delay in opening the new playground and spray showers in the Williamsbridge Oval Park, the volunteer group Friends of Williamsbridge Oval Park is gathering and requesting that concerned residents join them at 4:30 today in the southern section of the soccer field near the construction fence. We’ve heard from Parks officials at the site that the spray showers and playground should be open by July 4, but the Friends are insisting that the renovated areas open by the end of school on June 28. We’ll have more later today on official word from the Parks Department on when these new play areas will be open for ruse.