The actual dates for activities (Prague)

Hi there, I'm new to InterNations and thinking about looking for a job in Prague...
Been only once there (about two months ago) and planned a weekend from February 14th until 16th in the evening. The initial plan was to hook up with someone, but... I'm afraid that boat has sailed. Looking at the events that weekend, I can only see the Valentine's Event (yes, on that specific date), but for example the InterNations 3rd Business Networking doesn't have a specific date... It just says "in the next few weeks".

Am I missing something here or most of the events just don't have a specific set date up to a couple of days beforehand?