Regarding issue whit opening hidden events by amount of item inside one day.
Looks like there is issue only in one of two cases.
I am not for sure yet what is an issue
Maybe
When we have multiple events on day which repeat on calendar.
I am susceptible that bug occurs when you tray to see multiple events on day which exist twice on calendar
Eg. if you try to open 3 th day and there is also 3th day of next or previous month on same calendar.
Or it is issue when you switch month from current to next or previous
Yes there is bug
I did reprduce it on
https://discourse.angusmcleod.com.au/c/events/events-sub/l/calendar
Can you check 1.1.2019 on calendar to see behaviour of multipe events