It depends on the state laws. Look up the law in your state. In GA, it used to be legal to OC without a permit. Now, a Firearms Permit is required to OC and to CC.
A semi-related story:
I had concealed carried (even though I believe in OC) 98% of the time in my local doctor's office. Then, the company that owns the office put up a no firearms sign. It pissed me off and I told the secretary that if I'm denied the right to carry, then they should protect me. It didn't go well!
So, on my next visit, I asked the Doctor if HE had a problem with my concealed carry as I had done on almost every visit. He reached down and shook a pistol in his pocket. I guessed right, it was a Ruger LCP .380.
It turns out that someone called in to say that they were going to kill the doctor and everyone else there. He was happy that I was carrying, but I told him I wasn't carrying as I wanted to talk to him first. He said he wanted to go to his truck to get his .40, but one of "the girls" had the LCP.
We were escorted out, to our vehicle, by law enforcement. One officer said he believed in the right to carry. The other said if you open carry, you are making yourself a target. No, I didn't bring up OC or CC.
I see it both ways. If I was to rob a bank and I saw a guy with a gun, I would come back another day. Perhaps another robber would take me out. The point is, it is my choice. As it is with you. I suggest a permit, depending on your state laws.
Alan