Not too crowded.
I came here on a Friday night around 9pm. The bar was not crowded at all--it felt like it almost had a "neighborhood corner bar" kind of atmosphere. There was a live band on the stage to provide entertainment. The bartender was quick to refill drinks so I was happy with the service. My friend was impressed that they had Tullamore Dew, since surprisingly, not all Irish bars here in Denver actually stock it. The parking lot, however, was SUPER crowded. This irish bar is in a shopping plaza, so there's really no danger of running out of parking; however, another bar a few doors down draws a much larger crowd (also a much younger crowd), so expect to park relatively far away.