Absolutely. Just remember to tip your bartenders appropriately!
The theme for this wedding is "garden party"...or as Eric likes to call it, a spring wedding. General formal/cocktail attire is the move. Ladies, floral and spring colors are encouraged! Gentlemen, no suit/tie is required, but a nice button down and dress pants would be suffice.
The ceremony will be a smaller and brief event outside, on a (hopefully) typical Wisconsin May afternoon. The reception and cocktail hour will be inside the High Cliff Golf Club, that does have a nice deck and some outdoor patio space.
The ceremony will be a more intimate affair with a more selective number of people. 4:30pm is an ideal time for everyone to arrive at the reception venue.