Devil's advocate here .....Not sure how long you have been making soap, if you just do a few 2# batches a year or if you have 100's of stock ready to sell, so this is generalized answer.
For all the 'new' soapers, you better know how your soap does with a tried and true recipe BEFORE you start to sell. This means that you need to know how it does for all skin types in all seasons. Been making soap for more then a year.... yadda yadda yadda there are many posts on that subject.
Also know that if you make a Sub-par soap and there are other soapers there (who have the experience, put the years of learning in and a Good soap) they will be a bit p.o'd that you brought in crappy 'newbee' soap. It makes OTHER SOAPERS look bad when someone does this.
I have heard this many times in my booth. "oh I don't buy those because the last one I got scratched my arm...dried out my skin....turned orange spotted....lost the scent when I opened it a month later... (worst) felt like it burned my skin afterwards (this could be lye or EO's, who knows
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If it is truly a small FM, like under 15 vendors I would say skip it. More then 1 soap isn't worth it since they have been there for a while. Unless you are making M&P an they are making CP/HP , HUGE difference in these.
I have walked through some Craft Fairs and FM's and seen soap from a 'Bee' person that looked like crap. Others overly pretty and toppings that are $8.00 and M&P. Do they sell these? Sure but they don't stay except for the Bee person as her main thing was honey so the 8 bars of plain honey soap was no extra thing for her. Oh and it was wrapped in saran wrap
Get everything under control first. Changing packaging, signs or looks is fine but you need to make sure the soap you make is perfected.
Flame away, it doesn't bother me. I was chomping at the bit when I came back to soaping and asked about M&P just to get some soap to make for a market fast. I didn't end up doing the market as I hate M&P feel I found out. Wasted $$$ buying M&P..... that is still sitting here unused along with pounds of CP that didn't turn out to my higher standard. They are fine but not the look I wanted or shape or under sized. Which is fine because I will use it and I also donate to local homeless shelters.