Everyone loves a good party. And the best parties typically have at least two important factors: a gracious host and respectful guests.

But in a world where parties can include everything from birthdays, engagements and housewarmings to pet adoptions, divorce finalizations and reality show reunions, some of the traditional etiquette guidelines that help keep parties fun and cordial for everyone may have fallen by the wayside.

Hosts who rely on their guests to pay for the party may be setting themselves up for disappointment, for example. And guests who don’t show their appreciation and respect for the host’s efforts can also sour the mood.

Here are eight tips for hosts and guests to avoid common party faux pas, according to two etiquette experts.

For those tying their apron strings and putting out festive hand towels, here are four expert tips to host an event well.