When I went to Kalmthout in 2011 there were talks in the morning, then lunch and only after lunch did the sales open. That said there was a bit of a queue and the sales room was small and did get crowded. Whilst this year the UK Gala had a large room for sales and everything seemed civilised.
You need good waterproof boots to view the Hamamelis collection, not to mention the snowdrops and snowflakes in situ.