1. Bring someone who wasn’t invited
If this person wasn’t invited it was probably for a reason. If you bring them it just makes it awkward for everyone and going through the painful and awkward small talk is awful for everyone just save everyone from the awkwardness by asking before or just not bring them.
2. Bring up politics
Politics is always a sore subject. It is much safer to not bring it up. It is such a diverse subject that everyone has an opinion on it and it just doesn’t end well for anyone.
3. Say food will be ready at 5 p.m but won’t be till 7 p.m
Telling everyone the food will be ready at 5 and having everyone come and wait two hours is awkward and everyone will come hungry excepting the food to be ready when it isn’t is really disappointing.