How correct is this..?

Question

They did various activities: Once they would have an open day where the kids practice with their teachers some games and hobbies, and another they would go on a trip, and yet another they'd have a meeting to discuss the kids' problems as expressed by the simple people of the village.

grammatically..?
(it's a translation)

Answer 1

Semi-correct.

The only really grammatically incorrect thing is "practice with their teachers some games and hobbies"--you can't put a prepositional phrase (with their teachers) between a verb (practice) and its object (some games and activities).

But there are a few choices of words that, yeah, sound translated, and the use of "would" seems odd, suggesting that the activities were chosen almost at random. Technically, a day should be "when" and not "where".

Their activities varied, but included a day of open games and hobbies with the teachers, field trips, and meetings with the villagers to discuss the kids' problems.

(Unless by "practice" you really meant that they worked on getting better at the games and hobbies, then use practice. If they just engaged in the games and hobbies, say it my way.)

Answer 2

They did various activities: Once they would have an open day where the kids practice with their teachers, with some games and hobbies. Another day they would go on a trip, and yet another day they'd have a meeting to discuss the kids' problems as expressed by the simple people of the village.

There!

Answer 3

They did various activities. They once had an open day when the kids practiced games and hobbies with their teachers. Another day they went on a trip, while yet a third day they had a meeting to discuss the kids' problems as expressed by the simple people of the village.