There technically is no hard schedule. In places/cities where more than one congregation shares the Kingdom Hall, the meetings are especially flexible and the schedule is worked out between the congregations sharing the Hall. In my old/current congregation our Public Talk/WT study "rotated" annually and jumped from Sunday to Saturday.
BUT having said that if the town only has ONE congregation in the Hall (in the U.S.) the schedule will almost invariably be this for ENGLISH congregations:
Tuesday: Book Study (1 hour study of some WT publication, probably for the nth time)
Thursday: Ministry School/Kingdom Ministry (basically a little less than 2 hours, w/o going into specifics)
Sunday AM: Public Address/talk and Watch Tower Study (basically a little less than 2 hours) The WT Study is the only thing that purportedly studied worldwide more or less at the same time/the same week by JWs and we like to tout and brag about it as though it is really a big deal.
Interesting enough, I have noticed that Spanish congregations follow a slightly different schedule even if they are the only one and often like to have their Public Address/WT Study on Saturdays. I think it is because they like to party Saturday night and relax on Sunday.
All determnations of schedule are made by the local body of Elders. The only time a rigid schedule that does not vary is when the Circuit Overseer visits a congregation and that is because HE has to keep to a certain schedule and patter so the meetings will be on Tuesday and Thrusday invariably and be different also with the "book study" happening for the first part on Thursday.
PS: i just gave you the congregation reg meetings, I didn't deal with meetings for field service