Guests attending a bris typically bring a gift for the baby, such as money or a meaningful item like a book or clothing. It is also customary to bring a dish or treat to share at the post-ceremony meal. Additionally, some guests may choose to bring a card or flowers for the family to offer their congratulations.
No, unless you are their closest friends.
You may certainly bring a gift to a business open house if you want to. Perhaps the new owner is a personal friend. That is absolutely appropriate to do.
A good Bat mitzvah gift of money really depends on how close you are to this person. The Jewish tradition is to give gifts of money in multiples of 18.
Passover is not a gift giving holiday. If the question is regarding what to bring your hostess during Pesach (Passover), appropriate gifts are kosher le pesach wine, chocolates, dried fruits and nuts. There are also really nice tea gift boxes and things like that. I assume that you mean children gifts; educational games, such as QuestZion or Kosherland are mostly recommended by Jewish parents and educators. If you are looking for more adult-like gifts, then kosher wine, Seder plates, or some products of Israel would be very appropriate.
Jewish tradition considers it improper to handle money or to carry anything between public and private domains on the Sabbath, so if you are coming to a Sabbath service to celebrate the event, it's traditional not to bring the gift to the synagogue. Non-Jews aren't held to this commandment, though, and since many do bring gifts, it's common for there to be a basket where they can be left. If there's an "after party" on Saturday night, bringing gifts there is entirely appropriate. If the family is celebrating at a Friday evening service and the service start before sunset, it's entirely appropriate to bring gifts then.
You should only spend what you can afford. Usually the money is given in multiples of 18.
Ask them to replace gifts for foods and wine. At least to half of them.
Gift baskets make great gifts around holidays. They are most appropriate for people you have an established acquaintance with.
No Gift to Bring was created on 2008-11-25.
Unless the invitation or the person or people having the retirement party have requested not to bring gifts to the retirement party then you should bring a gift.
Gift is not necessary.