24 hours in I have now had 21 attempts; walked to work past a few event drops and picked up a couple plus some others. Then a stroke of luck - there are two event drops 5 minutes from the office and there is also a regular rare spawn point there - so far the drops have consistently delivered Gallimimus - nothing else. So basically I wait for the rare to appear - walk down there, get that and 2 Gallimimus and replenish darts. And repeat. Level 8 1/2 now :). Oh for a bigger park.