If you are struggling with how to keep Aunt Ethel away from Uncle Bernie, but still keep Grandma Mae with all of her sisters at the same table, then you should take a look at Perfect Table Plan. This software looks like a great tool to help with organizing your seating arrangements for your Bar/Bat Mitzvah. You enter your guest list, indicate who wants to sit next to whom, who CAN'T sit next to whom, etc. Then set up your floor plan with your tables (choose how many seats at each table and choose table shape). Arrange your floorplan--then you can either assign tables yourself, or the program can auto-assign based on your previously entered indications.  It will show you the distribution of males/females (blue/pink), kids/adults, and so much more. It prints out beautifully to give to your caterer, and it can even print out your place cards, address labels, etc.  It costs $35 to buy, but the trial version is free (you just can't print from it, or add more than 30 guests). This is definitely a must-see! Check it out and make your life easier!

Website: Perfect Table Plan 

Check out the Movie Demo of what the software can do