"Weekend plans" refers to the activities or things you have scheduled or intend to do during the weekend, which typically includes Saturday and Sunday.
I hope you have a fun weekend planned ahead. (seaofshoes.com)
Hope you are better in time for weekend plans. (nakedpastor.com)
My big weekend plans include a 10 - mile run (not sure what day it will happen because the weather looks a bit damp...). (confessionsofamotherrunner.com)