Open versus opened. There could be a competition to find the greatest number of different uses (with different meanings in different contexts) of the word "open". Even that headline "School gates open" can have two senses - one as an adjective meaning that the gates are now in the state of being open (sú otvorené dokorán), the other as a verb in simple present form (typical for English newspaper headlines, even though the action has already happened), indicating the action which the gates have performed (otvárajú/otvorili sa).

Be careful with this difference: the store was open/the store was opened. The first sentence simply tells us about the state of the store - despite the public holiday, they were serving customers. The second one tells us about the official opening of the shop on a specific day in the past, almost certainly by someone famous (probably Peter Cmorik these days, because Jožo Pročko is just so passé).