A / My Plan A / My Plan

Need an article : A ;or a determiner : my / that / this / etc.

I originally planned to visit a spring festival market today, but I was still a little bit tired, so I gave up. I originally planned to visit a spring festival today, but I was still a little bit tired, so I gave up.

It makes more sense for you to be visiting a festival celebrating the beginning of spring than a “spring market festival”. While the festival may have been similar to a market, with vendors selling things at stalls, if it is called a festival, you should refer to it as a festival.

I originally planned ton visiting a spring festival market today, but I was still a little bit tired so I gave up. I originally planned on visiting a spring festival market today, but I was still a little bit tired so I gave up.

"Planned to visit" isn't wrong, but I think it sounds a little more natural this way.

I originally planned to visit a s{Spring fFestival | New Year’s} market today, but I was still a little bit tired so I gave up. I originally planned to visit a {Spring Festival | New Year’s} market today, but I was still a little bit tired so I gave up.

I originally planned to visit a spring festival market today, but I was still a little bit tired, so I gave up. I originally planned to visit a spring festival today, but I was still a little tired, so I gave up.