Create page doesn't handle a rejected transaction signature gracefully

[TomAFrench]

Currently if I try to make an event and click the "create event" button then the button moves to the "sending transaction" state and I get a metamask popup. If I then decide that I don't want to sign that transaction and reject it then the "create event" button doesn't return to its original state, preventing me from clicking it again.

This requires a refresh to clear which in turn clears out the inputted form data. Ideally the button would listen for the callback from a transaction being rejected and become available for interaction again.