Creating Event freezing

Do you have this issue only when inviting specific Sims or do you get it on a regular basis on all your dates ?

It’s happened a few times with different sims. When I posted this it had just happened with Connie Fidential.  I also have it happen when trying to plan stay overs, it will freeze and if I haven’t saved beforehand I lose hours of play time. 

Could be it's because of the special role attached to her.