I am going to be visiting Israel for 2 weeks in October on an organized tour. I have never been Bat Mitzvah, and remember someone telling me it is possible to do so in Israel as an adult without many years of religious study. Becoming a Bat Mitzvah is not a customary ceremony in Israel whether it be as a 12 year old girl or an adult woman. While I can appreciate your strong desire to be brought 'officially' into Judaism the fact is this is a very uncommon aspect of religious life in Israel and thus may be difficult to arrange.
If you contact a conservative or Reform Rabbi they will probably be able to arrange something. Others here on the site may have names--or use the search feature because names have been mentioned in conjunction with Bar and Bat Mitzvah of kids,. BTW you may never have had any kind of ceremony--many adult women didn't but on your 12th Birthday you became a Bat Mitzvah. Bat Mitzvahs are a popular event in Israel , particularly in the Conservative, Reform, traditional and secular communities.
Anyone can organise one since they are more of an informal religious event. However, even to my secular ears, a Bat Mitzvah without any study of the traditions of Judaism seems rather meaningless.
As rdglady says, if you have passed your 12th birthday and are Jewish you are a bat mitzva with or without ceremonies, studying or anything else. Bat or bar mitzva simply means - roughly translated - "of the age of responsibility". I can understand your desire for a ceremony, but you are no less bat mitzva without it.
Even 40 years ago "bat mitzva" as a ceremony, apart from non-Orthodox streams of Judaism, was almost unheard of. Millions of women reached the age of "bat mitzva" without any kind of ceremony. Chana - I cannot believe that, as a tour guide, you really think that it may be difficult to arrange a Bat Mitzva ceremony in Israel. While it may not be in line with your own personal religious orientation, I'd expect you to know that it is perfectly possible to do this, and I'd expect you to help someone do something that will be meaningful to them.
