If you are not working with an Event Planner, then it a a good idea to check in with all of your vendors a few months before your celebration to discuss your expectations, your timeline, and set-up and breakdown times. It is also important to get a contact name and cell phone number for the "day-of" for each vendor. Often you will sign your contracts months and possibly years in advance and these specifics aren't discussed, but they are vital to the success of your event. Even though you are using amazing vendors, don't assume that everything will just "happen". Every party is different and everyone has a different "vision".
If you will be using a "Day-Of" Coordinator (and remember a good "Day-Of" Coordinator is really begins their work a few weeks before your event), then you can pass all of your vendor information on and they should follow up with each vendor to confirm all of the logistical details. If you are not using a "Day-Of" Coordinator, you will need to follow up with each of your vendors regarding logistics the week of your event. I also suggest you share all of your vendor information with a trusted friend who can oversee things for you so that you are not bombarded with last minute questions and issues. Remember, the goal is to feel like a guest at your celebration so leave nothing to chance.