Bob & Joana

If you are married already in US, you cannot re-marry(the legal process) in philippines! To legally marry in philippines you'd need an affidavit from embassy stating you are not married and eligible to marry -- which you could not get since you are married to her. I think what the aunt wants is a ceremony(you dont need to gather documents and all that). Basically just arrange with the church for a ceremony and a reception afterwards where all her family included extended will likely be expected to be invited. If you have budget constraints dont feel like you must accomodate everyone, you can always just set a maximum number of guests and let your wife choose who to invite. But if not, weddings are so cheap compared to in the US just think it is easily doable to pay less than $5 per person for a reception there! I think my reception with around 50 people ended up costing $250USD or so for cake, food(catered), a small amount of alcohol(I dont condone excessive drinking so I provided a minimum only), favors, and gifts for the sponsors. Im not sure if you need to file anything with your church of choice, but I'm guessing that 2 weeks in the country or less is all you'd need to arrange it.

Just to add my experience:
We're also a CR-1/IR-1. We did the medical early because I wanted to be absolutely sure that she wouldnt be flagged for sputum and delay the process. So as soon as we got her passport, I went with her to do st. lukes. You can go any time, just bring the NVC letter that she first received(and 2 copies!!), Passport, and the photos. They are very picky on the photos so make sure she is not wearing earrings -- my wife had earrings on and they made her retake the pictures(there is a place right across the street luckily). She does NOT need an appointment. I would recommend pre-registering online before you go and have her bring 2 copies of the registration paperwork. Bring copies of passport bio page just in case(cant remember if we needed that). Also, Their fee is due in Pesos only, not USD. She will need to stay over-night, as it is a 2 day procedure. We showed up kind of late at around 10:30am, and her first day was finished around 7pm. They scheduled her to return the second day at 2:30pm, and she was done with that by 4pm(they made her come back 2 weeks after for immunization since she was in a bad part of her menstrual cycle apparently?). Even with having to return later the second day they still gave us the chest x-ray CD and a receipt for the immunization schedule so your second day may take longer if she needs the shots done that day.
If everything is clear(no sputum) the medical(and in turn her visa) will be valid for only 6 months, so since you plan to leave as soon as you get the visa/cfo done im sure that is more time that you'll need. And im pretty sure they WILL turn away without the NVC letter in hand as they have so many people to process they cant simply take people off the street to 'make money' as someone else seems to think.
Good luck to you! Also, if you are looking for a hotel nearby we stayed at Best Western La Corona -- The big suite(with hottub, king bed, 2 TVs, Dining room, etc) was only $106/night! Only maybe half a kilometer walk(2 small blocks) away. Any questions feel free to message me.