If you were planning to attend today's annual water gun fight in Central Park, note that you've been banned from one of the biggest fields—the event will no longer kick-off on the Great Lawn, thanks to environmental concerns.

A Walk In The Park reports that the event, which is not sanctioned by the Parks Department or NYPD, has been heavily advertised via social media. Indeed, according to the event's Facebook page, over 64,000 people have RSVPed. And though Facebook event replies aren't an exact guest list, it appears organizers Brian De La Cruz and Joshen Abreu are concerned. "We are no longer doing it on the Great Lawn, " De La Cruz told the blog. "It's going to be spread out throughout the park."

The event's been going on for the past couple of years, and though organizers don't have a permit, "It's not illegal to have water guns in the park," De La Cruz said. Still, it's understandable that groups like the Central Park Conservancy are concerned about such a big event, and apparently authorities are worried people will damage the Great Lawn. The group posted the following message on the Facebook event:

IMPORTANT ANNOUNCEMENT! It seems the large volume of unexpected RSVP's this year has made the Parks Department worried about the lawn and littering which are our worries too. Instead of having everyone meet up on the great lawn, we will let everyone know what areas of the park(in terms of streets) will have others with water guns roaming and ready. Make sure to only wet the people with water guns and look for big open spaces with lower traffic to wait for others! Any walkways inside of the park between 66th st. And 86th st. (East or West) will have people searching for others to blast with their water guns. This will also improve the time it takes to refill weapons which gives you more time to shoot other teams! I'm sorry for the inconvenience but this shouldn't affect us very much. Make sure to only wet the people with water guns and look for big open spaces with lower traffic to wait for others! PS. Make sure to have a team or find a team to stick with and send in your group pictures!

Great Lawn or not, the event, which kicks off at 2 p.m. today, is very popular—see the rules on Facebook if you'd like to attend.