Question: I got a calendaring app and a terminology question.

An event that occurs just once, is a ***one-off***

If it occurs every second Monday, and/or 4th Friday of month it is ***regular***

If it happens on a random series of odd days, it is ***irregular***

But if it starts on 12-jan and runs every weekday until 3-mar and never happens again (like a museum exhibiton), it is ***what-non-technical-one-word***?

Answer: 
I would use 'recurring' for this. 

[dictionary](http://www.dictionary.com/browse/recurring)

> 
> recur
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> > 
> > verb (used without object), recurred, recurring.
> > 
> > 
> > 
> > > 
> > > 1.
> > >  to occur again, as an event, experience, etc.
> > >  2.
> > >  to return to the mind:
> > >  The idea kept recurring.
> > >  3.
> > >  to come up again for consideration, as a question.
> > >  4.
> > >  to have recourse.
> > > 
> > > 
> > > 
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> 

The event recurs on weekdays from 12 Jan through 3 Mar.
It is difficult to determine one word that conveys the exact mixture of meanings. However *['extended'](http://www.dictionary.com/browse/extended?s=t)* is an adjective that conveys the meaning of 'smeared out in time'.

> 
> adjective 
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> 
> 1 - stretched out: *extended wires.*
> 
> 
> 2- continued or prolonged: *extended efforts.*
> 
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> 3 - spread out: *extended flags.*
> 
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> 4 - widespread or extensive; having extension or spatial magnitude: 
>  *extended treatment of a subject.*
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> *www.dictionary.com*
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> 
> 

Thus the event would be called an *'Extended Event'*