As a guest speaker you need to do a little investigation about your host denomination. Familiarize yourself with their doctrines, idiosyncrasies, methods and proclivities.
Go a bit further to know the current mood in the particular congregation. This will guide you to manage your emotions and predict the reception you are likely to get.
For instance , a church who just had a burial activity can't be expected to respond promptly to your calls.

A guest speaker who decides to swerve from the topic given him into other areas is being rebellious to the host minister. Hence the need to have a note to guide you in your delivery. A guest speaker who is expected to speak on leadership should not speak on divine healing .

Raising funds as a guest speaker without obtaining the permission of your host before the meeting is regarded as an Ecclesiastical illegality. Your host must be in the know of whatever you intend to do with his microphone.
Try as much as possible to stay within the purview of the authority given to you. Attempt to impress your host by raising funds may boomerang.

It is not within your space to correct what you consider a doctrinal error in your host church .
That's why you should have done your homework on the host denomination . If you're not comfortable with their doctrinal stand, kindly turn down the speaking offer rather than making a mess of their doctrines on their platform. It is simply bizzare.