I had a need in one of my projects to do two different queries that result in similarly structured data. Instead of passing two variables into the template and then having to worry about the logic on the template side I wanted to merge them.

Thankfully Python provides a solution:

from itertools import chain

list = Model.objects.filter(foo=foo)
list2 = Model2.objects.filter(foo=foo)

final_var = list(chain(list,list2))

final_var is now a list containing both sets of results.