You insert rendezvous points into Vuser scripts to emulate
heavy user load on the server. Rendezvous points instruct
Vusers to wait during test execution for multiple Vusers to
arrive at a certain point, in order that they may
simultaneously perform a task. For example, to emulate peak
load on the bank server, you can insert a rendezvous point
instructing 100 Vusers to deposit cash into their accounts
at the same time.

It is nothing but waiting point.This point indicates all 
the Vusers  to meet at certain point inorder to generate a 
peak load on the server.

It allow the Vusers to generate peak load on the server at 
the same time.
For example if there are 100 Vusers, the rendevous point 
allow the 100 vusers to access the webpage at the same to 
check the peak load.

During a scenario, you can instruct multiple users to 
perform tasks simultaneously by inserting rendezvous 
point.It create intense load on the server and enables Load 
Runner to measure server performance.The users who arrive 
at this point wait for other users to come at the point and 
they simultaneously perform the task.We need to set the 
following in the rendezvous policy -
Release policy - How many Vusers will be released from a 
rendezvous at a time.
Timeout - How long the Controller waits before releasing 
Vusers from a rendezvous

These two terms are used interchangeably to denote the
maximum power requirement of a system at a given time, or
the amount of power required to supply customers at times
when need is greatest. They can refer either to the load at
a given moment (e.g. a specific time of day) or to averaged
load over a given period of time (e.g. a specific day or
hour of the day).

Rendezvous Point is the point where all the Vusers are
stopped at one point and are released at the same time as to
obtain concurrency.