Provide your guests with paper and pencils and ask them
to write as long a sentence as possible, the first word beginning with A, the second with B, the third with C, and so on.
The winner is the one who makes the longest sensible
sentence.
After this your guests could try making a story, using
the letters in the same way. This would mean that full-stops could be introduced. The winner would be the one
who made the best and longest story.
Another idea is to see who could make the longest story
or sentence using one letter only. The letter might be
suggested by one of the players.
Whoever made the longest
story or sentence could be rewarded by being allowed to
choose the letter for the next attempt.