Is an undergrad travel grant relevant to a CV?
Giving a poster talk at a major conference is certainly important in your CV. If the travel grant to go to the conference was based on academic excellence, then it should also be included in the CV. If it was a lottery, or based on non-academic merits it might be irrelevant. Nevertheless, even in the latter case, it doesn't harm to put it on your CV as it shows some initiative and dedication.