Donation sale announcement allowed or not?

[arakboss]

I am planning on donating at least 10% of sales I make during a three day period this month to NWFA. Is it OK to preannounce this donation period in a thread on the forum or do I have to wait until the day the donation period begins by mentioning the donation offer in each ad?
If it is allowed what is the most appropriate forum to post a preannouncement in?

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[Joe Link]

First of all, thank you!!

Starting a thread is fine, probably best in off topic