My initial reaction was Tuesday?! as well. But, I will say props for the enthusiasm.
Apoc was a little different than most wars. In the case of Apoc, we let tradition set the date. Normally, a host polls for interest in a set of particular dates. For example:
"I'm looking to host a nerf war at [_________]. I'd like to have it [Some date about a month from now]. However, I am also available these dates [Weekend days a couple weeks before and after]. Let me know what you would be interested in and we'll go with the date that works for me and the majority of perspective attendees.
The terrain you can expect is: Option A) Here are some pictures of the terrain. or
It is wooded/open/both. or C) Post both.
[Any special rules]"
You obviously did some of those things, but I thought I'd give you a more complete idea of what you should post.
It's also not a bad idea to look at the schedule and see when other Nerf wars in your region are. Since many people have to travel, bunching up dates doesn't always work. So, if you don't see anything going on in September, suggest a September war. Another issue to consider is any holiday that may be that weekend.
Lastly, I wouldn't normally list your address online. Find an address for the park or create a google maps page with the park pinned. People can then get directions to there. I'm editing out your address for your privacy.