I agree 'The period going from ...' does not work here. It implies further information in the sentence, and the equivalent french expression would then also be different.
We'd never say 'the period is going from...' in English, even if it is within the rules. This implies a sense of movement or variation, rather than of extent, so it just sounds silly. Someone suggested 'runs from' and to me that seems the smoothest. It is also unlikely I'd choose to say 'the period' in this context (we'd tend to use term or session or something like that) - but that is a nicety probably beyond the current capacity of duolingo. My feeling is that liberal acceptance (in English, because English is a bit like that) of natural usage - with alternative translations provided - is preferable to literal translation if it captures the meaning and overall sense of time and agency. This does happen here in many other expressions. It depends whether you consider the sense, flow and local nuance of the language to be important.
That serves a different role in the sentence than what we are given here. What you suggest is an isolated subject of the sentence, whereas what we are given contains both subject and predicate.
In case you aren't familiar with those terms, what we are given contains the subject of the sentence ("la période"/"the period") what it does ("va"/"runs" or "goes"), and then further specifies what it does by giving us the "when" ("de mars à août"/"from March to August"). What you suggest contains only the subject, and changes the description of when the period runs to a description of the subject.
"Aller" is the infinitive form, whereas "va" is the third person singular (present tense, of course). "Aller" is an irregular verb, but it's pretty common, so it won't take you too long to pick it up. In the present tense, it is conjugated as follows:
Hope that helps. :)
In the days of the week ("lundi a vendredi") - no ability add accent to "a" on my keyboard in comments - "a" was translated as "Monday through Friday", but "through was disallowed here. Since "through" means something quite different than "to", which is correct? I know "a" means "to", but the earlier Duo translation now has me confused in this case.
Thanks, but that is my point. "Monday through Friday" is inclusive of Friday, while "Monday to Friday" does not include Friday (though it is often incorrectly assumed to do so.) My question is whether in "mars a aout" here (or in "lundi a vendredi") the "a" includes the named end period (as in "through", or does not include the end period (as in "to", which strictly means "up to") The appropriateness of "to" or "through" depends on how inclusive the French "a" is, which is my question here. Sorry for the wordy response.
You say that "Monday to Friday" does not include Friday. I believe this is a dialectal difference, and it is quite possible that where you live it doesn't. However, where I'm from, it nearly always does include it, even if it didn't used to in the past, or isn't so throughout the English-speaking world. For instance, I would always understand something like "1850 to/- 1859 as including both 1850 and 1859, as well as all years in between. I would also understand "name the numbers from 1 to 10 in French" as including 10. This extends to months, days of the week, etc. Surely, when we say "everything from A to Z" you don't consider Z to be excluded?
To answer your question, however, the French is inclusive.
I agree with your statement, and thanks for the answer. I do find that the "to" becomes inclusive in casual usage, coincidentally leading to common scheduling confusion when people slip unawares into more time specific environments. I, par example, work as a project mgr and the distinction is very important in that surrounding. I have also seen confusion arise in school event scheduling because of the room for ambiguity. Cheers.
You're much better off just ignoring the hints, or using them with caution. They give many different translations that are not correct in every situation. Go by the given translation instead, or at least use common sense about which definition works best for a given sentence.