The great challenge list

To make it even more interesting and fun, I challenge you to challenge me.
In each city I visit I must do a challenge from one of you. The challenge rules are thus:

• It cannot be a challenge that is likely to get me arrested ( I can't break the law)

• It must be something regarding the local venue

• I have to be able to do it within a few hours ( or fail within a few hours )

• I can't put myself in mortal danger

• I can't make innocent people around me feel uncomfortable