Hi,
You can sell products and have event registration in the same website yes.
We did it with in our demo website.
The thing that you have to know is that, you can have both in the same cart. So at the moment when you add the event in your cart, you can't add regular products in your cart except if you empty it (and remove the event).
Otherwise, it works good.
Regards,
Jerome - Obsidev.com
HikaMarket & HikaSerial developer / HikaShop core dev team.
Also helping the HikaShop support team when having some time or couldn't sleep.
By the way, do not send me private message, use the "contact us" form instead.