yes, Jewish people do. not necessarily every week (possibly every week if they are orthodox).
Shabbat is a time of relaxation, people will read, study, and visit with family and friends.
It depends where you are, as the time of Shabbat depends on the time the sun sets. Chabad has a very useful online Shabbat calculator that allows you to enter your exact location and will then work out the time of Shabbat, Shabbat candle lighting and other important times for you. You can also visit the related link which will automatically find what time shabbat begins in your location.
For prayer and community.
sinagoga
At a shabbat service at your home or at a synogauge you may light the shabbat candles and say the shabbat blessings. Also some people follow it with hallah and/or a kiddush.
Some JCC's are closed on Shabbat while others aren't. You should call your local JCC or visit their web site to find out what their hours are.
Synagogues A synagouge
Shabbat is the 7th day of the week and starts Friday at sundown and ends Saturday at sundown. As Shabbat is the day of rest, it's more an issue of what activities are not allowed. During Shabbat, religiously observant Jews will refrain from the 39 forms of work as specified in the Torah. Instead, family and friends will visit, people go to synagogue, people will study (no writing), people will read, etc. It's actually a very relaxing and family oriented day.
They celebrate Havdalah.
No. Although organized prayer services are held 3 times a day, and 4 times on Shabbat and certain holidays.
Shabbat is the 7th day of the week and starts Friday at sundown and ends Saturday at sundown. As Shabbat is the day of rest, it's more an issue of what activities are not allowed. During Shabbat, religiously observant Jews will refrain from the 39 forms of work as specified in the Torah. Instead, family and friends will visit, people go to synagogue, people will study (no writing), people will read, etc. It's actually a very relaxing and family oriented day.
Bar mitzvahs are held at synagogues.