Use the present simple for fixed timetables, schedules and arrangements. Don't forget it closes at 10:30 on Sundays.
Use will for immediate decisions made at the same time as you speak/write.
I'll call you later.
Use will for something you think, guess or calculate about the future.
Most of the family probably will be there.
Use be going to for fixed plans or arrangements.
We're going to have a barbecue.
Use be going to for predictions you make because of a present evidence.
Judging from the grey sky, it's going to rain anyway.
Use present continuous for a personal intention or arrangement.
Gloria and I are meeting at about 9:30.
Use future continuous for something that will be in progress during a period of time in the future. I'll be working all weekend.
Use future perfect for something that will be finished before a time in the future.
Maybe you'll have done your various duties by the end of the evening.