I know that sports are very time consuming ... not from personal experience but from watching most of my friends.
In our team, we have a few people that do sports. Two of them, both girls in the soccer team, go to practice first and then come to Robotics. Usually, Robotics is until quite late, so they still have time to make it to the meetings ... and of course they come on the weekends.
Something to consider as well, is that Robotics takes up quite a lot of time for those 6 weeks and if you have lots of other activities to do it might interfere. What I'm trying to say is that you have to weigh the pros and cons and if you can drop some activities maybe you should. If you can't, do the best to manage them all, without killing yourself.

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I have to agree ... Dorienne Plait and I are quite a DUO in CD!!!
"The true nature of the modern condition - how weak we are, how helpless against ourselves in this proud era of so-called progress." - Max Beckmann.
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