Out of town guest

Considering Not EVERYONE Can Get Tested Just By Asking, I Don't Think That Would Work.

Also If Your Guests Have To Work Prior There's No Way They Can Self Isolate.

If You're Worried About Guests Safety, Then I Think Postponing Would Be Your Only Option Unless You Make It Local Guests Only.

Your Guests Know The Risk They Are Taking When Traveling And Being Around A Group Of People. If They're Willing To Take That Risk, Then They Can't Blame Anyone But Themselves If They Happen To Get Sick.

If Your Venue Is Requiring Social Distancing, Less people At Tables, Etc. That Would Help Too.

I agree with PP. I would think that anyone told to get tested to come to your event would find it quite rude. Plus, it can take a few days to get results back and in that time if they’re working they could potentially still be exposed to the virus.
If you are that worried about the health and safety of your guests you should postpone

Another thing to consider, if you do ask your guests to quarantine or test before coming, that does nothing because they’ll be getting on a plane to travel and will be potentially exposed. If they don’t fly, then there’s exposure at gas stations, rest stops, etc. You can’t expect them to quarantine in a hotel in the state you’re getting married. Therefore making the testing/quarantine irrelevant.

I would either make it a locals only event given the current circumstances, or postpone altogether

My out of town bridesmaids will likely not risk coming to the wedding with flying. Only my local ones or driving distance ones will likely come. I'm made my peace with it and it's honestly the best way at this point.

I agree with PPs. Unless you have a place where out of town guests can quarantine for 14 days...

You say you have people coming from NC and AZ. Parts of both of those states are currently spiking, it is unlikely they will be able to travel safely, even by August.

As for someone stopping here in NJ... we aren't yet at phase 1, so I don't know how feasible that will be.

I wrote about why I chose to postpone my Massachusetts, August wedding and it might be useful even if you don't want to postpone yours:
https://www.weddingwire.comwiedding-forums/why-were-postponing/3125cb7ca616936b.html

But, that's not what you asked for. I think there are a few issues with you being able to do this safely, but they're different than what PPs suggested. (MA had a worse outbreak, but better testing, than most other states, so we're in a very different place.)
Logistically:
It sounds like you would only be asking a small number of people to quarantine, which I think is fine especially if they're in your bridal party and are willing and able to do it, although they would have to quarantine AFTER they arrived. In MA, you can get tested if you have a public facing job even if you don't have symptoms, so if they arrived early in the week, they could get tested and have the results before your wedding. The issue is that the tests aren't that reliable. They apparently miss about 30% of people who should have tested positive. So, if you test positive, you have it, but if you test negative, you probably don't have it, which isn't super comforting.I'm sure the idea of Zooming people in probably isn't very appealng, but if it's just a few very important people it's worth looking into.They can dress up and you can have food (and drinks? and flowers that look like yours?) delivered to them and make it possible for them to give speeches if they had planned to so it feels more like they're actually there.Whatever you do, just make sure everyone is really careful (masks, hand washing, etc.) and try to keep your most vulnerable guests separated from everyone else if you can.

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