I've just been asked about an icebreaker for a large group of 100 people and I would definitely recommend Human Bingo if you haven’t done it already.
With a group of 100 it is going to be difficult for all to introduce themselves without taking a long time so it might be better to focus on each new person getting to know a group of people. So just cut the bingo down to getting say 12 or 15 signatures
Limericks is also good for a large group but you may want to make it easier by numbering the lines so people at least know which line they have – see page 14 of the incredible ice breaker games and ideas corporate collection.
Also try a more sedate version of “Changing Places” – have everyone stand in a circle on an A4 sheet of paper with one person (yourself) in the centre. The central person says something true about themselves like “I like to dance” or “I love music” or anything. Everyone that is in agreement with this comment must change places and find another place to stand. The person left without a place (because the central person has taken a place) takes the centre and the game starts again. Great for getting to know a bit more about people's like and interests.
For large groups seated around tables
If groups are to be seated around tables what about gathering a few everyday objects and putting them into a soft drawstring bag- one for each table – each table has to guess the contents by feeling them without opening the bag. Give them about 5 minutes and get them to record their answers and then ask them to pass the bag to the next table. At the end of the rounds read out the correct answers – the table with the most correct answers is the winner. N.B. you may not have time for each table to do more than 1 or 2 bags in which case each bag or half the bags could have the same content.
Guess the Candy!
Collect a few unusual shaped chocolate bars and/or candy - one for each person in the room. Put them into soft drawstring bags and place on the table. Each team must guess the type of candy, chocolate bar from the feel – get them to open the bag and see if they are right – each person then keeps the chocolate bar/candy!
For tons more fantastic ice breaker games for large and small groups check out our ice breaker ideas web-site