Given the fact that both bathroom and kitchen sinks are used almost every day, it is not surprising that they could clog or even break down at some point. Their wear and tear are caused by constant usage and frequent handling by many users.
The accumulation of debris within drainage pipes can cause clogging. Some sections may become blocked and require immediate cleaning service. It would be a terrible scenario to have blocked drainage during a time you are expecting visitors. Some blockages do not require a plumber being called in.
The first step would be to evaluate the problem. You may be able to fix the problem yourself if you have basic tools like pliers, screwdrivers, and draw wire.
If the blockage is found at a location that requires technical expertise, you should immediately contact your service provider. If you believe the blockage is minor, you can attempt to repair or remove it.
Do not try to fix it by trial and error. This could lead to more problems. Panic is the worst thing you can do in this situation. You must approach the problem systematically, focusing on the root cause. Once you have identified the problem, you will be able to find solutions. Identifying the cause is half the battle for solving the problem.
You should move on to the next step if you cannot narrow down the cause. Don't let despair and panic stop you from resolving the problem. You can actually resolve most clogged drainages with simple tools like plungers.