Could you please correct the both sentences with right punctuation ( from my point of view, it is only missing period, please correct me if I am wrong)
Hope all the mums are having great time.
Hope all mums are having a great time.
Hope all the mums are having great time. You are speaking of some specific group of mums that you expect the listener to be aware of. You need to say 'a good time'.
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Hope all the mums are having great time.
You are speaking of some specific group of mums that you expect the listener to be aware of.
You need to say 'a good time'.
Hope all mums are having a great time.
You are speaking in general, about all mums
You need to say 'a good time'.
In both cases, in standard English you would include the subject