Should I make contact with these girls before I see them at pub crawl or not?

its not till 2 weeks , the first Saturday in April. i know them cause i see them at bars downtown here every now and then and we've talked and bought them a shot before. i know there going to the pub crawl because there like team leaders or something. its mentioned on the site that promotes it there names and such.

i bought a ticket a few weeks back but haven't heard anything from them or the organizers , i went last year and it was pretty busy and fun night. but i didn't know these girls last year , we only meet more recently

maybe it be better if i like surprise them the night of the crawl and just show up , and then see how things go

Updates
1 mo
haven't heard anything from them yet and haven't tried to make contact , might see them Saturday when i go downtown in that city but they might of went home for Easter so not sure if i'll see them until actual night of bar crawl
Should I make contact with these girls before I see them at pub crawl or not?
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