You can rent the Lafayette Square community center on Pk Point. If you serve alcohol you have to hire a security guard. But it's pretty cool, b/c even though it's not fancy, guests can walk on the beach, there's direct access to it. I rented it for a 40th bday party and it worked out fine.

Owls club?

The Silver Broom Lounge at the Duluth Curling Club can be rented for receptions.  It has a great bar, kitchen and dance floor.  Contact:

[email protected]duluthcurlingclub.org

My wedding reception was at Glensheen in the winter garden. They even let you use candles, which is unusual.  However, there are only two accepted caterers, if that's important to you.

The Kozy Bar has a banquet space.

JJ Astor. Beautiful restaurant, great food, and an incredible view of Duluth (especially at night).

The womens' club is lovely.

Clyde Iron Works is a cool new venue, check it out

copy paste below....

http://www.clydeparkduluth.com/clyde-park-restaurant.shtml

A couple of outdoor ideas.  I did a wedding at Chambers Grove Park in Fond du Lac neighborhood with about 80 people once.  It was in the fall with great colors.  People could fish if they wanted.  Bonus I just learned some more about the history of that area and it is pretty cool.  Essentially the place where Ojibwe people stopped their long long westward migration perhaps around 500 years ago.  

Fremont Park (ZOO) is also beautiful.  That would be a unique location.  You might be able to fit 80 people in the shelter there.

This post is maybe the 5th I've seen here on the wedding question. The answers are pretty good, I mean a few people come out of left field, and a few of these seem almost like promotional plants,  but basically you get some good unique ideas.  PDD community is so cool.  Maybe PDD should do a wedding/celebration guide?  Listing venues, vendors etc and people's good stories about Duluth weddings.

I believe Grandma's Sports Garden has a nice banquet room now. http://www.grandmasrestaurants.com/sportsgarden/catering.htm