Were to attend vs attended

What is the difference in meaning when using 'were to' vs 'attended'?

http://www.canada.com/news/Vancouver+centenarian+prescribes+busy+days+long+life/6954701/story.html

1. "The seniors centre planned to celebrate Wayslow’s birthday with a party Thursday after the Courier’s press deadline. Wayslow’s two daughters, one 77 and the other 67, from out of town, and her girlfriend from her hometown Saskatchewan farming community were to attend along with her three granddaughters, younger sister, four nieces and nephews. "

2. "The seniors centre planned to celebrate Wayslow’s birthday with a party Thursday after the Courier’s press deadline. Wayslow’s two daughters, one 77 and the other 67, from out of town, and her girlfriend from her hometown Saskatchewan farming community attended along with her three granddaughters, younger sister, four nieces and nephews."

Thanks!