Joseph visits the club every 5th day.

Harsh visits the club every 24th day.

Sumit visits the club every 9th day.

The next time they will meet again will be the LCM of these time-periods.

LCM $(5, 24, 9) = 360$

So, all the three will meet 360 days after Sunday. Now, we need not count 360 days.

Rather we will use the concept of odd days.

Odd number of days in 360 = Remainder when 360 is divided by 7 = 3

So, they will meet again on Sunday + 3 = Wednesday