Howdy Massound,
Thanks for taking the time to report this. I see the problem. This is actually a result of how your theme lists event details. It groups them with Organizer, Venue, and Event all in one list with no distinction. Look at this (default) example on how they are grouped: You see how each has its own heading, and then under that appears its relevant details? Actually you could have up to three websites, one for the Event, the Organizer, and the Venue. And since your theme removed the headings you would not know which is which. This could be fixed by a modification to your theme. Either by adding the heading, or prepending the relevant word such “Event Website” to each. If you are not already familiar with it, our Themer’s Guide is how that would happen.
Does that make sense? Would either of those options work? If not, then you are probably not the theme author. You might contact them about a fix.
Please let me know if I can be of further assistance. If not, mind marking this resolved? Cheers!
– Brook