There are so many holiday events going on this weekend that I couldn't pick just one.
Here's this weekend's lineup:
Where: Sculpture Park in Loveland
Time: Friday - Saturday from 5 p.m. - 9 p.m.
What to expect: 
Photos with Santa and live reindeer (until 7 PM)
Loveland Parks & Rec trailer activities
RJ’s Amazing Entertainment: Ice Princess and Ice Queen meet and greets, glitter tattoos, and Mystic Twister balloon artist.
Free Admission
This event runs through January 1st
Where: Fort Collins Senior Center
Time: Sunday, 3 p.m. - 5 p.m.
$12 entry
This event is designed as a storytelling fundraiser for the Street Dog Coalition, which provides free veterinary care for creatures at risk of homelessness. This event is at a senior center so I expect it will be pretty low key and you can't bring your dog. However, you will go home with a goodie bag for your dog and enjoy an afternoon of stories with seniors while supporting a nonprofit.
Where: Candlelight Dinner Playhouse
Time: Sunday, 1:30 p.m.
Musical Theatre performance of a Disney classic. Dinner is included and because this is a sit-down event, I believe it is better suited for kids aged middle school and up.
Where: NoCo Theatrix
Time: Sunday, 2:30 pm
This is a musical performance that runs all weekend, but Sunday is the only day that isn't sold out.
This event costs $10 for adults and $5 for four and under