The author makes it sound like precise dates are never given, like you just get an invitation to a "summer" event and are expected to just show up whenever?
There's a utility to telling people early in the planning stage "Hey, we're gonna be hosting this thing vaguely in summer" and send out the proper date when you've set one.
(Though point taken about the seasons, maybe something like "2nd Quarter" would be less culturally ambiguous?)
They have not provided examples; for all it seems, their suggestion could attack the use of "we do it twice per year, so we called one the Summer event and the other the Winter event". Which is just a fuzzy adoption of the terms for practical reasons. Not an «oversight», not a «mistake»: just a quick neutral labelling for calling things some way.
There's a utility to telling people early in the planning stage "Hey, we're gonna be hosting this thing vaguely in summer" and send out the proper date when you've set one.
(Though point taken about the seasons, maybe something like "2nd Quarter" would be less culturally ambiguous?)