Many of the guests have never eaten herring, danced around a midsummer pole or slept with seven kinds of flowers under the pillow.
That is why Paola Sievers wanted to invite foreign-recruited doctors and nurses to a really traditional celebration.
- When you are new in Sweden and it is Midsummer's Eve, it is just too miserable if they are to sit alone, says Paola Sievers.
Guests are more than welcome to bring dishes or anything else to the midsummer table - which is perhaps what differs from the most traditional.
- It is hard to be alone in a foreign country - we are like a small part of this big day, says Valentyna Sevastianova, medical researcher at Sahlgrenska University Hospital.
Start the clip to see how the celebration went.