This was something I was used to seeing in Mum's home. The staff actualy used to joke about the effect of the full moon!
There are a number of techniques used in the homes.
Firstly if there are people not getting on they try to ensure that they are not seated together for a while.
If they see that a problem is arising a carer will generally step in to defuse the situation
If this appears to fail they will try and relocate a resident to another area, their bedroom, an office where someone is working and give them a cuppa etc.
Sometimes a resident will be taken to their room for some time out and their TV/radio etc. put on
Sometimes, if appropriate, a resident will be taken out for a walk.
The staff will learn to look for indicators of poor behaviours before they happen and also the times of days and situations upon which they happen.
Mum's staff were also aware that although Mum was mainly "sweet" she could be "feisty"!! They always tried to ensure that residents with similar abilities both physical and otherwise were grouped together. This tended to prevent the problems that could erupt if someone became aggressive while sitting next to someone extremely frail.
Yes, at sundowning time you could get walking sticks at 6pm. You learned when you visited regularly what happened.
It was not always easy for the staff, quite literally because without one to one cover there were always occasions that the whole palce could erupt (normally full moon hence the earlier comment) No one knew why, but I assume from having young kids that they feed off one another's emotions.
Let the staff know the situation. If the are forewarned then they are most likely to succeed with behavioural interventions at an early stage.
Mameeskye