I'm with Marydoll on this one! Everyone invited to the whole shebang! ... Or at least everyone you want to invite!
When our DS and DiL were married, they decided that they were only going to invite people who they were close to, who they really wanted to be at their wedding - this also included close friends of ours, and DiL's parents. No extended family/cousins/etc., who they never see. The wedding was overseas, but everyone they invited, who was important to them, came. Around 100 guests in total. Late afternoon ceremony, which flowed beautifully through from champagne reception, until breakfast served in the wee small hours! I dare say there were some family members a little miffed at not being invited (in fact, I know so!), but you can never please everyone, and at the end of the day, it's the bride & grooms wedding!
I do hate these split weddings where guests who are not so important are relegated to just the evening do. I guess when you're young and perhaps have lots of work colleagues, it's OK, but I personally couldn't be bothered nowadays to attend just an evening do.
Our daughter has said she and her partner will do just the same when they decide to marry ... definitely no split wedding!