Egads... when my husband turned 65, I organised a surprise party for him with just his family (he has 4 bros + sis's + nieces/nephews, some we don't see often). It was after we'd been to Spain for almost 3 weeks, so he was definitely not expecting anything.
I emailed the families and gave them the pre order menu for the pub-private room meals to choose from with a note in huge capital letters that I was paying for all meals! If I gave a dinner party at home for people, I certainly don't ask them to contribute to my grocery bill. They'd bring wine or bubbly but not cash for food.
It was up to the family to decide what gifts to give, and they were very generous. Mostly tools... he's big on DIY and it was great.
He was so surprised and we all had a wonderful time. I didn't do a 70th one, but may do something next year for his 75th as it will be our 25th wedding anniv at the same time. Hopefully a big holiday away, but certainly won't be asking the family to contribute to that!