In reply to tinkadventures:
I had a number of calf strains a few years ago while terrain running ... on each occasion it took about six weeks to get back gradually to full speed. A podiatrist then spotted that my calf muscles were tighter than they should have been, and daily stretching solved the problem.
I got back to climbing more quickly ... you'll certainly be OK for late July if you avoid a recurrence.
The injuries came when I had increased my climbing, and I thought that all the 'standing on toes' may have caused the muscle-tightening.