This is for our church.
They want to be able to have the ability to unlock and lock front door for special occasions.
I already have it in scheduled times for normal functions but we are finding more and more "off schedule times" are needed.
No one wants to be going in and setting date/time/device for every special event and i havent given access to hubitat apps, just the dashboard....no one is tech savory to be creating rules.
I expect you will need / want a specific app to handle this, but I could be wrong. You could start by working on the display and selection of the date and time values using Hub Variables on a dashboard. Device selection could be problematic...
Would not want to put you off P:erhaps was a little premature to got down the coding path. Others may have either custom or hopefully built-in options that are more accessible than what I can offer.