I've posted an explanation and demo of some indoor flash photography techniques over at PentaxUser.com. This post looks at some simple light and colour balancing approaches for indoor people shots, using Pentax equipment with on -camera bounced automatic flash exposures.
It's all casual family stuff, but the techniques and considerations are applicable to many more formal situations and larger venues. Please take a look and see if there's anything interesting for you to try out, and please post up here any variations or experiences of indoor event flash working ....
https://www.pentaxuser.com/forum/topic/indoor-events--mixed-lighting-techniques-55493