Is this Japanese sentence correct?

Question:

I want to say that martin and yolanda went to london for a textiles fair, so far I've got:

"Yolanda san to Martin san wa london ni imashita kara 'London orimono expo' imashita"

But I'm pretty sure that the particles are incorrect, any help would be greatly appreciated!

Answer:

We actually say ロンドン テキスタイル フェア (rondon tekisutairu fea) for London Textile Fair

"Yolanda(-san) to Maachin(-san) wa London Textile Fair wo miru tameni London ni ikimashita."
(as a turist)
"------ (ditto) --- Fair ni sanka suru tame, London ni ikimashita" (on business)