Reception recieving line and arrival etiquette

Hi all,



We are having a smallish ceremony with around 60 people. We are then having our wedding breakfast and speeches, with the reception starting at 1800. We have invited more people to the reception around an extra 60. My query is how do we greet these people? Should we do a recieving line? Are people prompt to a reception? I think yes but my other half thinks no. I can't see that people can just turn up whenever and wander in? Starting thinking about it as wondering how to ensure everyone gets a drink for the reception (were not open bar but want to provide one or two drinks per person). Does anyone have any cute ideas how to do this? Thanks