Des Moines Register 03/02/06 This just in DATEBOOK STAFF VEISHEA ROCK, PARTICLE JAM Plans are firming up for free Veishea concerts during the student celebration at Iowa State University in Ames. Three outdoors stages will present bands April 22. Full lineup TBA, but rock band Cross Canadian Ragweed has announced itself as a performer alongside Robert Earl Keen. Also in Ames, Los Angeles jam band Particle returns to People's Bar & Grill for an April 11 show with opening act That One Guy. Tickets cost $15 and go on sale at noon Friday through www.iowatix.com or at People's.