"I just solved a problem with a Mac user who was having problems with her Calendar on the iPad," John Carter informs us. " Every calendar entry suddenly disappeared, but it was all there on her laptop. Every trick I knew was tried to no avail. Ultimately, there was only one trick left. The solution was to delete the iCloud account on the iPad and then recreate it. This deleted all iCloud related information on the iPad when the account was deleted, but it came back again once she signed back on to iCloud on the iPad. I am sure the same applies to laptops and desktops.
And John signs off with this reassurance, "Unlike dangerous stunts, you can try this on your own."