While there are a lot of nice places outside the hotel & convention center, weather
is an important factor that may prevent these places from effectively holding gatherings and photo-shoots. It seems like every Katsucon there's gorgeous weather on Thursday & Friday, but Saturday & Sunday is filled with high winds, freezing temperatures, and this year on Saturday: snow.
While some cosplayers and photographers may tough the cold and wind to get that perfect shot, a lot are concerned for their health and don't want to risk being outside for too long a time.
I paid the price on Sunday afternoon to go to Elevation Burger. I've been sick ever since the con ended.