Adding content to my website

I need help adding content to my Outdoor Directory website I'm putting together. I've been talking to a few Equestrian organisation about joining my website. They are very keen to be listed and adding their events/show diaries to the website.

But due to the way their website's and systems work they cant provide a excel document so they would have to be copied and re-entered to the website one by one then the account handed to the relevant organisation on completion.

Anymore information need please let me know