You're probably planning on inviting a lot of people to your child's Bar Mitzvah or Bat Mitzvah, so be sure you have a good decor display. The 1970's theme offers a fun opportunity to use creative lights and disco balls for all the decor and you have a built in music selection by just playing the disco classics. Be sure to grab all of the disco dancer silhouettes and swirl glow backgrounds to set the tone for your party. When the party is over, you can save the decorations and use them for plenty more events.
Your child is still at the age that they can appreciate cool glowing items and flashing lights, so don't shy away from these items. They set your party apart and provide great photo opportunities. This party will be an unforgettable memory for your child as they grow up, so be sure to the decorations stand out in your child's mind.