持ち寄りパーティーって英語でなんて言うの？

The get together where everyone brings something, usually something that they have personally made, is referred to as a Potluck dinner. It is quite common in English speaking countries, especially for younger people and students because it's a good way to save money and still have a party. Older people also participate in this type of get together. It is fun with people from different cultures and countries, in this sense, the dinner is more about tasting cultural dishes and tradition recipes, rather than saving money. "I am having a potluck dinner Saturday night, you are welcome to join us, of course, you must bring something" Even if it is just wine or beer, or even the chips, everyone must bring something. Other names for this type of dinner, party or get together are: potluck dinner, spread, Jacob's join, Jacob's supper, faith supper, covered-dish-supper, dish party, bring-and-share, shared lunch, pitch-in, bring-a-plate, dish-to-pass, fuddle, fellowship meal, and carry-in. But the most common name is Potluck, at least in the US. Different countries may have different ways to call this gathering.

Come dine with me is a popular television show in Great Britain where contestants each host a dinner; showing off their culinary skills. So in colloquial English a dinner where people bring their own food to the party can be referred to as a come dine with me party.

A bring-a-plate party is one in which everyone brings a dish along to share with others at the party. Please note that it doesn't have to be on a plate, any ready-to-eat dish is acceptable.

A potluck, or bring-a-dish party is designed to share the costs of a meal together and make life easier for the host who does not have to cater the entire meal. Sometimes guests will be asked to provide a dish for a particular course (a main dish, a salad or a dessert for example) and other times the choice is left entirely to the guest. Some guests choose the opportunity to showcase a favourite or special dish. Guests who choose to provide something that doesn't require additional complicated preparation at the site will find they'll be the most popular with the host! Cold finger food type dishes tend to go down well.

A potluck is a party where people bring homemade foods to a place. This is usually done with friends or with coworkers. It is also done at religious events so as to diminish the costs. These kind of parties are a lot of fun.

A "Potluck" is the most common term for a party where everyone brings a large dish of one type of food, such as salad, pasta or rice dishes. The dishes are all put out on a table and you have a little of everyone's dish. Another less common term for the part is a "Bring-a-dish" party. In both cases, you don't need to include the word "party". Eg: 1) "I am having a potluck on Sunday, can you come, and will you please bring your famous chicken salad?". 2) "We are going to welcome the new team member with a bring-a-dish at my house this weekend.".