Can You Hold a Corporate Event or Summer Party at Lonna Island?

Planning a corporate event or summer party in Helsinki in 2026? Forget the standard hotel conference room or the predictable rooftop bar. A corporate event at Lonna Island offers something genuinely different: a historic island setting in the Helsinki archipelago, just ten minutes from the city centre, where old stone buildings, open water, and warm hospitality come together to create something your colleagues will still be talking about in December. Whether you are organising a board-level meeting for a handful of people or a summer festival for four hundred guests, Lonna has the space, the food, and the atmosphere to make it happen.

We are a seasonal destination on a small island between Helsinki’s Market Square and the Suomenlinna Fortress, and our mission is simple: to give every guest, whether a leisure visitor or a corporate delegate, a genuine sense of place. Here is everything you need to know about hosting your next event with us.

Mine Storehouses: Space for 25 to 400 Guests

The Mine Storehouses are the heart of our event offering and the reason so many companies choose Lonna as their island event venue in Finland. These two historic stone buildings were originally used to store naval mines during Lonna’s military era, and their thick walls, vaulted ceilings, and raw industrial character give every event an atmosphere that no purpose-built venue can replicate.

Together, the buildings open onto a 400 m² partly covered private terrace with views across the water, creating a seamless flow between indoor and outdoor space. The entire area is fenced off as a private stone-walled zone, so your guests have the island atmosphere entirely to themselves. This setup works beautifully for everything from intimate company dinners of 25 guests to large-scale summer parties in Helsinki of up to 400 people, including crayfish parties, product launches, team celebrations, and full summer festivals.

The Mine Storehouses are also available as meeting spaces. Each building accommodates 40 to 80 guests in a seminar layout, and by combining both buildings you can host seminars of up to 160 delegates. A half-day booking runs from 09:00 to 16:00 at €1,300, while a full-day booking from 10:00 to 23:30 is available at €2,750. For larger private events and summer parties, explore the Mine Storehouse details and enquire directly on our services page.

Meeting Rooms for Smaller Groups

Not every corporate gathering needs a grand venue. Sometimes the most productive meetings happen in a focused, intimate setting, and that is exactly what our smaller meeting spaces are designed to deliver.

Vartiotupa: The Compact Meeting Room

Vartiotupa is our dedicated meeting room for groups of 2 to 10 people. Priced at €390 including VAT, it comes fully equipped with a 55-inch LCD screen, a flipchart, and wireless internet. It is available from 09:00 to 17:00 and offers a calm, distraction-free setting that is ideal for strategy sessions, interviews, or small team workshops. The fact that you are sitting inside a historic island building, rather than in a generic office block, tends to sharpen focus rather than distract from it.

Keltainen Talo: The Yellow House

Keltainen Talo, or the Yellow House, is our mid-sized option for groups of 10 to 40 guests. At 120 m², it offers a generous, flexible footprint with a projector, screen, and wireless internet included. It is bookable at €150 per hour with a minimum of two hours, making it a practical choice for half-day workshops, team briefings, or creative sessions where people need room to move around. The combination of natural light and a maritime backdrop makes it one of the more inspiring meeting rooms available in the Helsinki archipelago.

Catering and Meeting Packages

A well-fed team is a focused team, and our catering is designed to keep energy levels high throughout the working day without feeling like an afterthought. For full meeting days, we offer a catering package that includes a light breakfast, a hearty lunch, and afternoon coffee at €67 per person including VAT. Everything is prepared in our kitchen using high-quality Finnish ingredients, with organic and locally sourced produce at the core of what we do.

Our restaurant also handles group bookings for parties of more than ten guests, offering a seasonal menu that always features vegetarian, meat, and fish options across starters, mains, and desserts. Menus shift during the season to reflect the best available produce, so a June dinner will feel quite different from a September one. Wine tastings can also be arranged for groups looking to add a social dimension to their event. This level of culinary care is what sets a company event in the Helsinki archipelago apart from a standard catered conference.

How to Reach the Island with Your Team

Getting to Lonna is part of the appeal. The island sits just 1.5 kilometres from the mainland, and the journey takes approximately ten minutes on the FRS Finland waterbus, departing from Keisarinluodonlaituri pier at Helsinki’s Market Square. For most Helsinki-based teams, that means a short walk from the office or a quick metro ride to the city centre, followed by a scenic crossing that immediately signals to everyone that this is not a typical workday.

For guests travelling from further afield, Market Square is well connected by public transport, and the pier is easy to find. We recommend coordinating departure times in advance when bringing a larger group, so that everyone arrives together and the event can begin on schedule. The short crossing also works as a natural icebreaker, giving colleagues a few minutes of fresh sea air before the day’s agenda begins.

How to Enquire About Your Event

Whether you have a clear brief or are still in the early stages of planning, we are happy to help you find the right setup for your group. Every event at Lonna is a little different, and we enjoy working with organisers to shape something that fits their team and their goals.

For restaurant group bookings of more than ten guests, meeting room reservations, or Mine Storehouse event enquiries, the easiest way to get started is through our contact form. Send us your event enquiry here and we will come back to you with availability, pricing, and any additional details you need. Our season runs from May to the end of September, so if you are planning a summer party on a Helsinki island for 2026, now is a great time to check dates and secure your booking before the calendar fills up.