Is there a common abbreviation for "announcement"?
If there is, what is it?
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The abbreviation for announcement would likely depend on the type of announcement concerned.
A party or other social event might use RSVP, as might baby showers or wedding showers (in the US). An invitation to a different type of event, such as a recital, might include something similar.
Wedding invitations (or save the date announcements) will usually include some variation of "Announcing the wedding of [A] and [B]." A birth announcement will usually include some variation of "Announcing the arrival [or birth] of [Baby]."
The best answer, I think, is that it depends on what you are announcing. I'd consult examples of other texts similar to whatever you'd need to produce.