Issue Wauld credentials when new members RSVP to Mighty Networks events

Confirming interest in a Mighty Networks event with a small reward can boost turnout, but setting that up manually for every event is tedious. This Zap automatically issues a Wauld credential whenever a member RSVPs to an Event in your Network, giving early confirmers a certificate of participation right away. It's a simple way to reward engagement before the event even starts.