• Business Insider asked etiquette experts about the mistakes guests should never make at weddings. • Guests shouldn't ignore the RSVP deadline or arrive late to the ceremony. • Overindulging at the bar, bringing an uninvited guest, and taking food home are all major faux pas.

No one wants to be that guest at a wedding. You know, the one everyone is whispering about for walking in during the middle of the ceremony or having a bit too much fun at the open bar.

A lot of time, effort, and money go into planning a wedding, so it's important for guests to be on their best behavior during the festivities.

That's why Business Insider asked four etiquette experts about the mistakes wedding guests should never make. Here's what they said.

Ignoring the deadline to RSVP

Weddings, especially

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