Multiple dinos have been now combined and the park event for a specific group spanning multiple days assuming people might not get chance/time to go out and hunt everyday. There are many people who do not have a park event nearby. For them going everyday/multiple times a day might not be feasible (also considering time zone difference around the world).
Also initially, the park event used to only occur once in a while, but currently they have become standard and occurring every week. Also, the number of dinos appearing have been increased. e.g.: 5 common dinos (total 60 attempts) in 2 days compared to 2 common dinos one each day.
I agree to the point where they make park event dinos disappear once you reach the max limit similar to the treasure chest events. Also, increase the number of spawns when there are multiple dinos in single day so they are evenly distributed.