The other THING that made that night special for me WAS/WERE the GUESTS.
Do we bring "was" because of "thing" or "were" because of "guests"?
The other THING that made that night special for me WAS/WERE the GUESTS.
Do we bring "was" because of "thing" or "were" because of "guests"?
You should use "was" instead of "were." After all, it's "subject-verb agreement" because the verb must agree with the subject, not the object. To better remember this, you can try replacing the entire subject with "it" if it's singular.