No it is not the normal process, but we have heard that there are Cachers out there, that will log the Will Attend, do not show up and after some weeks edit the WA to an Attended, as that does not generate any kind of notification.
This week we had a CITO where we tested that and during testing we found that it is possible and use any date.
Basically the better solution would be to remove the possibility to change any log (Will Attend, Write Note, Need Reviewer Attention) to Attended, but as Groundspeak itself gives the possibility, I'm not sure if you want to overrule it in Cachly.