Make a calendar

Name it, pick the time zone its times are in, and you are through. You will add the dates on the next screen.

Calendar name

This is what subscribers see in their calendar sidebar, so make it recognisable to them rather than to you.

Time zone

Times you enter are read as local to this zone.

Edit password (optional)

Protects the edit page. The subscribe link stays open, because calendar apps check it unattended and cannot answer a password prompt.

You get two links: one to edit, one to share.
Pasted schedules are read in your browser and shown for correction before anything is saved.
Keep the edit link. There are no accounts and no password reset, so it is the only way back in. Lose it and the calendar cannot be edited again by anyone, including us.