I see that sellers will be able to start checking in an hour to an hour and a half before the start of swap meet each night. I assume we'll be lining up at the main entrance of the South Hall, the one facing South Market Street.
Will there be any particular order that sellers will be checked in, say by their registration number as in years prior, or will it be first come first served like last year?
At this time it seems like it will be first come, first served. With the amount of space we have this year I don't believe we've even filled all of the spots so there will be room for everyone. Additionally, we will be allowing a bit more freedom with placement and the selection of spaces as has been done in previous years.

I have a gathering to go to on Friday and I am also selling on Friday. Will it be possible to rush in at 8 with my stuff and still get my spot that I paid for?
Given how much space we have for sellers I'm guessing we will still have your space available for you at 8 PM Friday. However, I would email swapmeet@fanime.com so we can make a note of your later arrival in the event all spaces are filled.
I know for previous years dollies weren't allow to transport stuff for swap meet. Is it allow this year? And if they aren't allowed, what items are allowed for use to transport the goods? (ie rolling suit case, folding shopping carts, etc)
As ben mentioned in an earlier response, we are of the mind that carts/dollies are still not allowed to transport items this year. Rolling suitcases are permitted, and as I mentioned before, you are welcome to employ some muscle of your own to help you bring your goods in. Swap meet staff will be limited in the amount of support they can offer in this way.
Chairs will be permitted for all sellers as well, so you don't have to sit on the floor all night 
If I get some friends to help me, will they need badges just to help me bring some stuff in?
On Thursday, only active sellers (and seconds) will be required to have their badges. If you have a few people helping you carry stuff in, they will not need to produce a badge. If you do have an assistant who will be staying in the spot with you to help sell, that person
WILL need a badge on Thursday. As a reminder, all parties (buyers and sellers) are required to have a badge on Friday night.
So I got my two partners for Fridaya and got the forms filled out with our info. However, one of my parnters who has a sellers [ermit is also staff told me that that he thinks I need to to email Swap Meet team because they won't let him sale because he's not in the system.
Yeah, I would recommend emailing swapmeet@fanime.com to get it worked out. I know Ben's been swamped so hopefully he'll get to you before Thursday.

Hello! Ran through the whole topic and could not find the answer to this question. Do helpers need to bring a sellers permit as well? Just asking to find out how many to print out.
I also don't have any of my helpers in the system as I am unsure which of my friends will be finished with registration beforehand. Is it alright to just enter them manually in the sellers agreement or should I contact swapmeet ASAP?
Helpers do not need their own sellers permit. As was mentioned earlier, the majority of swap meet sellers do not need to fill out a BOE form because they qualify as "occasional sellers". As a result the swap meet registration form is sufficient. There will be a place on the registration form to list your designated "second" or helper for the evening. This is all you have to do to "authorize" your second. Remember, they also have to be in possession of their badge for Thursday night as well. So yes, it's alright to enter them manually in your sellers agreement right up until the point you check in.
Hope this helps!