This problem of Calendar crashing has been reported by @Silverpulser on Beta 22623.1325, but in my case, it failed with R.P. 22621.1343 while it worked fine in Beta build 22623.1325. 😎🤷♂️
I did a Repair and then a Reset of the Mail and Calendar App and then it started working again. 😉🤷♂️