Missing items found how do I prevent them from being lost again?

[Nanainsat]

Calendar items went missing last night found them by stumbling around. They
were lost again this morning this posting helped find them. How do I prevent
this from happening again?

 

[Diane Poremsky [MVP]]

where did you find them? without knowing more details about the lost and
found, we can't offer suggestions on how to prevent it.