I know that Orient Bay receives regular visitors (the same week every year) during the months of January-March. Does this hold true for April as well?

I'm sure there are regulars every week of the year. Just as we go every May and see the same people.

That's great. We're thinking of making the 3rd week in April our regular week and are hoping to run into the some of the same people yearly.

We go the week before Easter every year which varies but generally the first half of April. Over the past 3-4 years, we've seen "some" of the same couples - maybe 4 or 5 from the previous year. Before Irma, there were far more of the same people, but largely due to so many of the visitors being "Club O regulars".

If you're contemplating the third week of April, that's usually the beginning of low season, and yeah, there are a lot of regulars then.