If it helps everyone else, the number of hearts (or, stars) you need or are short of, will show up at the bottom left before the start of the date (or, job).
Back in July, I had the same issue. Tech support replied saying: "We are sorry to hear about the trouble you are having, and our delay in responding to you. We do not recommend trying to play this game on multiple devices. Trying to use iCloud to transfer the game back and forth, will result in progress loss, and in some…
After another event, dropped to FIFTH place!!! Lost over a million fans this time. I'm not spending any more money on this game until they fix their issues. They don't even have bonus stars for jobs anymore...