[Grammar] a group of people: followed by a singular verb or a plural verb?

[kadioguy]

line-up
a group of people that has been brought together to form a team or take part in an event

https://dictionary.cambridge.org/dictionary/english-chinese-traditional/line-up
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line-up
a group of people, especially performers, who have agreed to be involved in an event

https://www.ldoceonline.com/dictionary/line-up#line-up__5
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line-up
A line-up is a group of people or a series of things that have been gathered together to be part of a particular event.

https://www.collinsdictionary.com/dictionary/english/line-up
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Are both a singular verb and a plural verb acceptable?

 

[bubbha]

With collective nouns ("group", "team", "staff", "class", etc.), the singular verb is more common in the US, while the plural verb is more common in the UK.

 

[jutfrank]

With collective nouns ("group", "team", "staff", "class", etc.), the singular verb is more common in the US, while the plural verb is more common in the UK.

Definitely not so here. In all varieties of English, we would say

The line-up for Glastonbury this year looks good.

 

[Roman55]

line-up
a group of people that has been brought together to form a team or take part in an event

https://dictionary.cambridge.org/dictionary/english-chinese-traditional/line-up
---------

line-up
a group of people, especially performers, who have agreed to be involved in an event

https://www.ldoceonline.com/dictionary/line-up#line-up__5
-------

line-up
A line-up is a group of people or a series of things that have been gathered together to be part of a particular event.

https://www.collinsdictionary.com/dictionary/english/line-up
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Are both a singular verb and a plural verb acceptable?

To answer the actual question, yes, both singular and plural can be used, but it all depends on what you want to emphasise; the singular nature of the group or the plural aspect of its members.

Look at the three definitions that you quote. In the first one a group of people has been brought together. (I would still have used the plural, myself).

In the second, the people have agree to be involved.

In the third, there are people or a series of things that have been gathered.

 

[jutfrank]

To answer the actual question...

Thank you, Roman 55!

It seems I misunderstood the question. Somehow I didn't see the highlighted red words.