For B2B events the budget depends heavily on scale and ambitions.
The main cost items are the venue (a corporate space with good acoustics) and the catering (lunch, coffee, dinner for top guests). On top of that come speakers and experts, technical production (registration app, voting tools, live broadcast), marketing and PR. For B2B events you pay extra for quality guests, personal matchmaking of attendees and top speakers. The return is measured in valuable connections, not so much in pure attendee numbers.
Live Impact optimises B2B budgets for maximum quality of contacts.