Selective times for Virtual/In Person

Just like you can make selective times for ML conferences, you can do this for marking some times/days in person, virtual or both. 

You need to create a conference first with all the days and times and SELECT Family Selct (both in person/virtual). Then 

Go to your conference and click edit (in upper right).

Then, at the bottom there is a button Update Virtual/Inperson - select that:

Update times as you would like: