"Dyn ni'n mynd i'r cyfarfod cyffredinol heddiw."
Translation:We are going to the general meeting today.
Perhaps because 'we go...' tends to indicate a repetitive or habitual event:
- 'We go to Aber every Thursday/morning/week
whereas a one-of event would tend to use 'we are going...':
- We are going to the meeting in Aber today/tomorrow/next week.
Not always the case, of course, but in composing prompts and answers we tend to go with the expressions that we are aware of in common use, rather than a full set of all possible versions.
OK, thank you, ibisc. In my head I was hearing myself read out a list of the week's appointments. ' Monday we go to the Dentist, Tuesday morning we go to the shops'....... Like that. I take your point about the common useage though.