I'm willing to give you guys the benifit of the doubt that your team did a cursory search to make sure that the Peoples Park group wasn't anything criminal or hateful and you missed that it had ties to Fireman and is actually an astroturf campaign. It's an easy mistake to make given that is the whole point of an astroturfing campaign.

More importantly, going forward, what new vetting procedures are you putting in place before allowing a group to host an event at your establishment?

Blatantly false. This is the first time I have heard of you. The tweet and your interactions in the thread are my first impression of you and they are strongly negative. This has nothing to do with policy and everything to do with your lack of decorum.