Word Check: "Watch Out" For The Announcement

A friend asked if it is appropriate to say "Watch out for the announcement" as it applies to people standing by for a concert, as opposed to "Watch for the announcement".

I was briefly stumped as I obsessed my own usage of the phrasal verb and decided to open http://www.dictionary.com/. The entries are as follows:

watch (wŏch) v.

1. To look or observe attentively or carefully; be closely observant: watching for trail markers.

2. To look and wait expectantly or in anticipation: watch for an opportunity.

3. To stay alert as a devotional or religious exercise; keep vigil.
4. Phrasal Verb(s): watch out-->To be careful or on the alert; take care.

Based on these explanations, perhaps "Watch out for our concert" has become a habit, albeit an erring practice in the grammatical sense. If, on the other hand, the concert will be revolutionary, earth-shaking and the type that will create a storm amongst fans, then "watch out" could be applied because maybe it means "this is going to change things" or "this will never happen again" in music history. Also, if there is something sketchy about the concert, like the possibility of getting trampled on, then "watch out" definitely fits the bill because more often than not, "watch out" is used as a warning. However, on an ordinary basis, like giving the heads-up for a typical seminar, or updates for an event, it would simply be fine to say "Watch for some updates and visit our blog".

Thoughts?