Which Sentence Is Correct?

[Fatemah]

1 - She was wearing a nice dress on her wedding.
2 - She was wearing a nice dress at her wedding.

[Mamyalynne]

2

[Atheist]

2 sounds better to me. Perhaps even 'She wore a nice dress for her wedding.'

[dannyk13]

at

[Bazile]

'At'

It would be 'on' if you say -

'' She was wearing a nice dress '' on'' her wedding day''

[davebro]

I think a wedding dress should be a bit more than just "nice"!

[Canary42]

IMHO both.

[William51]

No 2. At her wedding.

[webbo3]

1 - She was wearing a nice dress on her wedding day.
would be correct.
2. is correct

[jourdain2]

2. If it said 'on her wedding day' that would be different.

[Theland]

2

[webbo3]

Jourdain
\\2. If it said 'on her wedding day' that would be different.//

Thats what I said

[THECORBYLOON]

WEBBO, you said example 2 was correct,

"1 - She was wearing a nice dress on her wedding day.
would be correct.
2. is correct"

[webbo3]

I said what should be correct and what is correct

[THECORBYLOON]

Well, it's good that the native speakers can sort out the niceties of the English language...

[rowanwitch]

Try she wore a nice dress on her wedding day, a lot easier

[jno]

2. A wedding is an event, so it's like "at a party".

[myenglishpath]

The correct answer is:
"... at her wedding"

A similar sentence is given in Cambridge Dictionary:
"I got completely drunk at my sister's wedding."
https://dictionary.cambridge.org/dictionary/english/wedding