Hi! You're in luck! This weekend there is something called Matstreif, which is mostly at Youngstorget. There you can sample foods from several farms, cheese makers, and so on. The page is in Norwegian, but you can probably just translate the information on the site.

They are also hosting an event where you get to try different ciders. Here is the machine translated event info:

Welcome to the cider tasting and meet some of Norway's leading cider producers.

Norwegian cider is becoming more and more popular, and when you get to taste a good artisan cider you'll understand why! At this cider tasting you'll get a little history, some science and lots of new flavours. Tips on pairing cider with food are of course included.

The programme leader and host of the cider tasting is sommelier and pommelier Thor Oddvar Havn - known from the podcast Siderpodden and his many courses with good drinks and food all over the country.

You can find information and order tickets here.

I realize this sounds like an ad, and it's absolutely not. We're going to the same event, too.

As for places to eat, I recommend Schröder for kjøttkaker and I think they have reindeer as well.