Planting out Bi annuals & Flowers for early June?

Hi all, I started out loads of sweet williams and shasta daisy seeds last autum in my unheated greenhouse, there doing ok but some are looking a little straggley, whens a good time to start planting them out into the garden? (need to get the seeds trays there in back) we're still getting some night frosts but they've had much worse than that in the greenhouse over the winter. I'm presuming there quite hardy....
 I've also agreed to enter my villages open gardens this year thinking it would be july/august time but have just discovered its in the first week of june, I can't imagine much of my garden will be in bloom then, the last few years I didn't have any flowers untill the end of july, is there any annuals anyone could recomend that would be in bloom by june? I've got a pink, red and white theme in my garden....
Thanks....

Thats a shame about the seeds, am amazed my village are holding their open gardens so early, It is very likely I am the only person around here that grows from seed, all the posh houses all have ready bought baskets and fancy planters but here, in the token council house street, I refuse to pay more than a quid for a plant or a packet of seeds. Really glad I did grow a few trays worth of sweet williams and shasta daisys last year so i'll get started hardening them off and plant them out, have been making my flower beds bigger over the winter so have lots of gaps to fill!
Thanks again