milwaukee-based immigrants right group cancel plan take children demonstrations outside republican national convention start monday cite fear violence last week shoot dallas voces de la frontera voice border typically include children march seek humanize debate immigration policy opt cleveland things escalate group member daniel gutierrez say donald trump expect officially become republican candidate president convention run monday thursday myriad protest group around country expect converge cleveland protest trump campaign events turn volatile tensions could heighten presence citizens carry firearms ohio gun laws allow people openly carry firearms protest innocuous items tennis ball umbrellas steel point water gun prohibit police say presence openly carry weapons complicate job dallas protest shoot former u.s. army reservist shoot dead five police officer seek revenge police kill black men 45 members voces de la frontera plan participate coalition stop trump rally monday say gutierrez add unafraid others may bring gun anything come put live risk definitely go stand anything break remove go safe location gutierrez say brad sigal spokesman minnesota immigrant right action committee say organization train marshal keep group safe primarily steer members clear potential confrontations 50 members would travel cleveland say lot police may counterprotests get message go sigal say aware situation prepare it rustbelt medics group street medics volunteer first aid political events conduct medical train preparation convention gloria tavera medical student street medic group say rustbelt medics train 50 people prior convention part train definitely involve happen people get hit rubber bullets tavera say protesters keep kid away cleveland republican convention